<?xml version="1.0" encoding="UTF-8"?>
<!-- (c) XBRL International.  See http://www.xbrl.org/legal -->
<link:linkbase
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"
	xmlns:link="http://www.xbrl.org/2003/linkbase"
	xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
	xmlns:xlink="http://www.w3.org/1999/xlink">
  <!-- roleRef -->
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_businessTransactions" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_businessTransactions"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_documentInformation" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_cor_documentInformation"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_lnk_summaryReportingTaxonomies" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_lnk_summaryReportingTaxonomies"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_entityParty" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_cor_entityParty"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_organizationIdentifier" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_organizationIdentifier"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyAddress" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyAddress"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyWebSite" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyWebSite"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContact" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyContact"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyContactPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyContactFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_entityPartyContactEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_specifiedAccountingMethodStructure" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_specifiedAccountingMethodStructure"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_assignedAccountant" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_assignedAccountant"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantAddress" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_accountantAddress"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContact" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_accountantContact"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_accountantContactPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_accountantContactFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_accountantContactEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_specifiedReportingCalendar" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_specifiedReportingCalendar"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_reportingCalendarPeriod" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_reportingCalendarPeriod"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionHeader" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_transactionHeader"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerAdjustment" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_headerAdjustment"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionHeaderReferencedDocument" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_transactionHeaderReferencedDocument"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerParty" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_headerParty"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyAddress" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyAddress"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyWebSite" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyWebSite"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContact" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyContact"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyContactPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyContactFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_headerPartyContactEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerPartyOrganizationIdentifier" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_headerPartyOrganizationIdentifier"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerAmountStructure" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_headerAmountStructure"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerTax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_headerTax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionDetail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_transactionDetail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_taf_originatingDocument" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_taf_originatingDocument"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailParty" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_detailParty"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyAddress" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyAddress"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyWebSite" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyWebSite"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContact" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyContact"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactPhone" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyContactPhone"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactFax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyContactFax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactEmail" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailPartyContactEmail"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailPartyOrganizationIdentifier" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_detailPartyOrganizationIdentifier"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionDetailReferencedDocument" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_transactionDetailReferencedDocument"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailMeasurable" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailMeasurable"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_ehm_detailSerialOrLot" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_ehm_detailSerialOrLot"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailJob" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailJob"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailAdjustment" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_detailAdjustment"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailAmountStructure" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_detailAmountStructure"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailTax" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_btx_detailTax"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailDepreciationMortgage" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_bus_detailDepreciationMortgage"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_lnk_detailRichTextComment" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_lnk_detailRichTextComment"/>
  <link:roleRef roleURI="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_detailXbrl" xlink:type="simple" xlink:href="btx-all-oim-2026-12-31.xsd#link_cor_detailXbrl"/>
  <!-- arcroleRef -->
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_businessTransactions">
    <!-- p_btx_businessTransactions all (has-hypercube) h_btx_businessTransactions link_btx_businessTransactions -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_businessTransactions" xlink:label="p_btx_businessTransactions" xlink:title="p_btx_businessTransactions"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_businessTransactions" xlink:label="h_btx_businessTransactions" xlink:title="h_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_businessTransactions" xlink:to="h_btx_businessTransactions" xlink:title="all (has-hypercube): p_btx_businessTransactions to h_btx_businessTransactions" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_businessTransactions" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_businessTransactions to d_btx_businessTransactions" order="1"/>
    <!-- domain-member -->
    <!-- p_btx_businessTransactions to targetRole link_cor_documentInformation -->
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#p_cor_documentInformation" xlink:label="p_cor_documentInformation" xlink:title="p_cor_documentInformation Document Information"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_documentInformation" xlink:from="p_btx_businessTransactions" xlink:to="p_cor_documentInformation" xlink:title="domain-member: p_btx_businessTransactions to p_cor_documentInformation in link_cor_documentInformation" order="2"/>
    <!-- p_btx_businessTransactions to targetRole link_cor_entityParty -->
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#p_cor_entityParty" xlink:label="p_cor_entityParty" xlink:title="p_cor_entityParty Entity_ Party"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_entityParty" xlink:from="p_btx_businessTransactions" xlink:to="p_cor_entityParty" xlink:title="domain-member: p_btx_businessTransactions to p_cor_entityParty in link_cor_entityParty" order="3"/>
    <!-- p_btx_businessTransactions to targetRole link_btx_transactionHeader -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_transactionHeader" xlink:label="p_btx_transactionHeader" xlink:title="p_btx_transactionHeader Transaction_ Header"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionHeader" xlink:from="p_btx_businessTransactions" xlink:to="p_btx_transactionHeader" xlink:title="domain-member: p_btx_businessTransactions to p_btx_transactionHeader in link_btx_transactionHeader" order="4"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_documentInformation">
    <!-- p_cor_documentInformation all (has-hypercube) h_cor_documentInformation link_cor_documentInformation -->
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#p_cor_documentInformation" xlink:label="p_cor_documentInformation" xlink:title="p_cor_documentInformation"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_cor_documentInformation" xlink:label="h_cor_documentInformation" xlink:title="h_cor_documentInformation"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_cor_documentInformation" xlink:to="h_cor_documentInformation" xlink:title="all (has-hypercube): p_cor_documentInformation to h_cor_documentInformation" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_cor_documentInformation" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_cor_documentInformation to d_btx_businessTransactions" order="1"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_documentType" xlink:label="cor_documentType" xlink:title="cor_documentType Document Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_documentType" xlink:title="domain-member: p_cor_documentInformation to cor_documentType Document Type" order="2"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_auditNumber" xlink:label="cor_auditNumber" xlink:title="cor_auditNumber Audit Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_auditNumber" xlink:title="domain-member: p_cor_documentInformation to cor_auditNumber Audit Number" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_revisesAuditNumber" xlink:label="cor_revisesAuditNumber" xlink:title="cor_revisesAuditNumber Revises Audit Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_revisesAuditNumber" xlink:title="domain-member: p_cor_documentInformation to cor_revisesAuditNumber Revises Audit Number" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_actionToTakeWithPreviousData" xlink:label="cor_actionToTakeWithPreviousData" xlink:title="cor_actionToTakeWithPreviousData Action to Take with Previous Data"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_actionToTakeWithPreviousData" xlink:title="domain-member: p_cor_documentInformation to cor_actionToTakeWithPreviousData Action to Take with Previous Data" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_language" xlink:label="cor_language" xlink:title="cor_language Language"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_language" xlink:title="domain-member: p_cor_documentInformation to cor_language Language" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_creationDate" xlink:label="cor_creationDate" xlink:title="cor_creationDate Creation Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_creationDate" xlink:title="domain-member: p_cor_documentInformation to cor_creationDate Creation Date" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_creator" xlink:label="cor_creator" xlink:title="cor_creator Creator"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_creator" xlink:title="domain-member: p_cor_documentInformation to cor_creator Creator" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_documentComment" xlink:label="cor_documentComment" xlink:title="cor_documentComment Document Comment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_documentComment" xlink:title="domain-member: p_cor_documentInformation to cor_documentComment Document Comment" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_periodCoveredStart" xlink:label="cor_periodCoveredStart" xlink:title="cor_periodCoveredStart Period Covered Start"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_periodCoveredStart" xlink:title="domain-member: p_cor_documentInformation to cor_periodCoveredStart Period Covered Start" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_periodCoveredEnd" xlink:label="cor_periodCoveredEnd" xlink:title="cor_periodCoveredEnd Period Covered End"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_periodCoveredEnd" xlink:title="domain-member: p_cor_documentInformation to cor_periodCoveredEnd Period Covered End" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_periodCount" xlink:label="cor_periodCount" xlink:title="cor_periodCount Period Count"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_periodCount" xlink:title="domain-member: p_cor_documentInformation to cor_periodCount Period Count" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_periodUnit" xlink:label="cor_periodUnit" xlink:title="cor_periodUnit Period Unit"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_periodUnit" xlink:title="domain-member: p_cor_documentInformation to cor_periodUnit Period Unit" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_periodUnitDescription" xlink:label="cor_periodUnitDescription" xlink:title="cor_periodUnitDescription Period Unit Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_periodUnitDescription" xlink:title="domain-member: p_cor_documentInformation to cor_periodUnitDescription Period Unit Description" order="14"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_sourceApplication" xlink:label="cor_sourceApplication" xlink:title="cor_sourceApplication Source Application"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_sourceApplication" xlink:title="domain-member: p_cor_documentInformation to cor_sourceApplication Source Application" order="15"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_targetApplication" xlink:label="cor_targetApplication" xlink:title="cor_targetApplication Target Application"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_targetApplication" xlink:title="domain-member: p_cor_documentInformation to cor_targetApplication Target Application" order="16"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_defaultCurrency" xlink:label="cor_defaultCurrency" xlink:title="cor_defaultCurrency Default Currency"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_documentInformation" xlink:to="cor_defaultCurrency" xlink:title="domain-member: p_cor_documentInformation to cor_defaultCurrency Default Currency" order="17"/>
    <!-- p_cor_documentInformation to targetRole link_lnk_summaryReportingTaxonomies -->
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#p_lnk_summaryReportingTaxonomies" xlink:label="p_lnk_summaryReportingTaxonomies" xlink:title="p_lnk_summaryReportingTaxonomies Summary Reporting Taxonomies"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_lnk_summaryReportingTaxonomies" xlink:from="p_cor_documentInformation" xlink:to="p_lnk_summaryReportingTaxonomies" xlink:title="domain-member: p_cor_documentInformation to p_lnk_summaryReportingTaxonomies in link_lnk_summaryReportingTaxonomies" order="18"/>
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  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_lnk_summaryReportingTaxonomies">
    <!-- p_lnk_summaryReportingTaxonomies all (has-hypercube) h_lnk_summaryReportingTaxonomies link_lnk_summaryReportingTaxonomies -->
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#p_lnk_summaryReportingTaxonomies" xlink:label="p_lnk_summaryReportingTaxonomies" xlink:title="p_lnk_summaryReportingTaxonomies"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_lnk_summaryReportingTaxonomies" xlink:label="h_lnk_summaryReportingTaxonomies" xlink:title="h_lnk_summaryReportingTaxonomies"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_lnk_summaryReportingTaxonomies" xlink:to="h_lnk_summaryReportingTaxonomies" xlink:title="all (has-hypercube): p_lnk_summaryReportingTaxonomies to h_lnk_summaryReportingTaxonomies" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_lnk_summaryReportingTaxonomies" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_lnk_summaryReportingTaxonomies to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_lnk_summaryReportingTaxonomies" xlink:label="d_lnk_summaryReportingTaxonomies" xlink:title="d_lnk_summaryReportingTaxonomies"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_lnk_summaryReportingTaxonomies" xlink:to="d_lnk_summaryReportingTaxonomies" xlink:title="hypercube-dimension: h_lnk_summaryReportingTaxonomies to d_lnk_summaryReportingTaxonomies" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#lnk_summaryReportingTaxonomyId" xlink:label="lnk_summaryReportingTaxonomyId" xlink:title="lnk_summaryReportingTaxonomyId Summary Reporting Taxonomy ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_lnk_summaryReportingTaxonomies" xlink:to="lnk_summaryReportingTaxonomyId" xlink:title="domain-member: p_lnk_summaryReportingTaxonomies to lnk_summaryReportingTaxonomyId Summary Reporting Taxonomy ID" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#lnk_summaryReportingTaxonomySchemaReferenceHrefAttribute" xlink:label="lnk_summaryReportingTaxonomySchemaReferenceHrefAttribute" xlink:title="lnk_summaryReportingTaxonomySchemaReferenceHrefAttribute Summary Reporting Taxonomy Schema Reference Href Attribute"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_lnk_summaryReportingTaxonomies" xlink:to="lnk_summaryReportingTaxonomySchemaReferenceHrefAttribute" xlink:title="domain-member: p_lnk_summaryReportingTaxonomies to lnk_summaryReportingTaxonomySchemaReferenceHrefAttribute Summary Reporting Taxonomy Schema Reference Href Attribute" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#lnk_summaryReportingTaxonomyHeader" xlink:label="lnk_summaryReportingTaxonomyHeader" xlink:title="lnk_summaryReportingTaxonomyHeader Summary Reporting Taxonomy Header"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_lnk_summaryReportingTaxonomies" xlink:to="lnk_summaryReportingTaxonomyHeader" xlink:title="domain-member: p_lnk_summaryReportingTaxonomies to lnk_summaryReportingTaxonomyHeader Summary Reporting Taxonomy Header" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#lnk_summaryReportingTaxonomyDescription" xlink:label="lnk_summaryReportingTaxonomyDescription" xlink:title="lnk_summaryReportingTaxonomyDescription Summary Reporting Taxonomy Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_lnk_summaryReportingTaxonomies" xlink:to="lnk_summaryReportingTaxonomyDescription" xlink:title="domain-member: p_lnk_summaryReportingTaxonomies to lnk_summaryReportingTaxonomyDescription Summary Reporting Taxonomy Description" order="6"/>
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    <!-- p_cor_entityParty all (has-hypercube) h_cor_entityParty link_cor_entityParty -->
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#p_cor_entityParty" xlink:label="p_cor_entityParty" xlink:title="p_cor_entityParty"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_cor_entityParty" xlink:label="h_cor_entityParty" xlink:title="h_cor_entityParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_cor_entityParty" xlink:to="h_cor_entityParty" xlink:title="all (has-hypercube): p_cor_entityParty to h_cor_entityParty" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_cor_entityParty" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_cor_entityParty to d_btx_businessTransactions" order="1"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_partyName" xlink:label="cor_partyName" xlink:title="cor_partyName Party Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_partyName" xlink:title="domain-member: p_cor_entityParty to cor_partyName Party Name" order="2"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_partyId" xlink:label="cor_partyId" xlink:title="cor_partyId Party ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_partyId" xlink:title="domain-member: p_cor_entityParty to cor_partyId Party ID" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_partyRole" xlink:label="cor_partyRole" xlink:title="cor_partyRole Party Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_partyRole" xlink:title="domain-member: p_cor_entityParty to cor_partyRole Party Role" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_partyBusinessDescription" xlink:label="cor_partyBusinessDescription" xlink:title="cor_partyBusinessDescription Party Business Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_partyBusinessDescription" xlink:title="domain-member: p_cor_entityParty to cor_partyBusinessDescription Party Business Description" order="5"/>
    <!-- p_cor_entityParty to targetRole link_bus_entityPartyPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyPhone" xlink:label="p_bus_entityPartyPhone" xlink:title="p_bus_entityPartyPhone Party_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyPhone" xlink:from="p_cor_entityParty" xlink:to="p_bus_entityPartyPhone" xlink:title="domain-member: p_cor_entityParty to p_bus_entityPartyPhone in link_bus_entityPartyPhone" order="6"/>
    <!-- p_cor_entityParty to targetRole link_bus_entityPartyFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyFax" xlink:label="p_bus_entityPartyFax" xlink:title="p_bus_entityPartyFax Party_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyFax" xlink:from="p_cor_entityParty" xlink:to="p_bus_entityPartyFax" xlink:title="domain-member: p_cor_entityParty to p_bus_entityPartyFax in link_bus_entityPartyFax" order="7"/>
    <!-- p_cor_entityParty to targetRole link_bus_entityPartyEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyEmail" xlink:label="p_bus_entityPartyEmail" xlink:title="p_bus_entityPartyEmail Party_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyEmail" xlink:from="p_cor_entityParty" xlink:to="p_bus_entityPartyEmail" xlink:title="domain-member: p_cor_entityParty to p_bus_entityPartyEmail in link_bus_entityPartyEmail" order="8"/>
    <!-- p_cor_entityParty to targetRole link_bus_organizationIdentifier -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_organizationIdentifier" xlink:label="p_bus_organizationIdentifier" xlink:title="p_bus_organizationIdentifier Organization Identifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_organizationIdentifier" xlink:from="p_cor_entityParty" xlink:to="p_bus_organizationIdentifier" xlink:title="domain-member: p_cor_entityParty to p_bus_organizationIdentifier in link_bus_organizationIdentifier" order="9"/>
    <!-- p_cor_entityParty to targetRole link_bus_entityPartyAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyAddress" xlink:label="p_bus_entityPartyAddress" xlink:title="p_bus_entityPartyAddress Party_ Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyAddress" xlink:from="p_cor_entityParty" xlink:to="p_bus_entityPartyAddress" xlink:title="domain-member: p_cor_entityParty to p_bus_entityPartyAddress in link_bus_entityPartyAddress" order="10"/>
    <!-- p_cor_entityParty to targetRole link_bus_entityPartyWebSite -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyWebSite" xlink:label="p_bus_entityPartyWebSite" xlink:title="p_bus_entityPartyWebSite Party_ Web Site"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyWebSite" xlink:from="p_cor_entityParty" xlink:to="p_bus_entityPartyWebSite" xlink:title="domain-member: p_cor_entityParty to p_bus_entityPartyWebSite in link_bus_entityPartyWebSite" order="11"/>
    <!-- p_cor_entityParty to targetRole link_bus_entityPartyContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContact" xlink:label="p_bus_entityPartyContact" xlink:title="p_bus_entityPartyContact Party_ Contact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContact" xlink:from="p_cor_entityParty" xlink:to="p_bus_entityPartyContact" xlink:title="domain-member: p_cor_entityParty to p_bus_entityPartyContact in link_bus_entityPartyContact" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_defaultAccountingMethodPurpose" xlink:label="cor_defaultAccountingMethodPurpose" xlink:title="cor_defaultAccountingMethodPurpose Default Accounting Method Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_defaultAccountingMethodPurpose" xlink:title="domain-member: p_cor_entityParty to cor_defaultAccountingMethodPurpose Default Accounting Method Purpose" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_defaultAccountingMethodPurposeDescription" xlink:label="cor_defaultAccountingMethodPurposeDescription" xlink:title="cor_defaultAccountingMethodPurposeDescription Default Accounting Method Purpose Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_defaultAccountingMethodPurposeDescription" xlink:title="domain-member: p_cor_entityParty to cor_defaultAccountingMethodPurposeDescription Default Accounting Method Purpose Description" order="14"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_fiscalYearStart" xlink:label="cor_fiscalYearStart" xlink:title="cor_fiscalYearStart Fiscal Year Start"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_fiscalYearStart" xlink:title="domain-member: p_cor_entityParty to cor_fiscalYearStart Fiscal Year Start" order="15"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_fiscalYearEnd" xlink:label="cor_fiscalYearEnd" xlink:title="cor_fiscalYearEnd Fiscal Year End"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_cor_entityParty" xlink:to="cor_fiscalYearEnd" xlink:title="domain-member: p_cor_entityParty to cor_fiscalYearEnd Fiscal Year End" order="16"/>
    <!-- p_cor_entityParty to targetRole link_bus_specifiedAccountingMethodStructure -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_specifiedAccountingMethodStructure" xlink:label="p_bus_specifiedAccountingMethodStructure" xlink:title="p_bus_specifiedAccountingMethodStructure Specified_ Accounting Method Structure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_specifiedAccountingMethodStructure" xlink:from="p_cor_entityParty" xlink:to="p_bus_specifiedAccountingMethodStructure" xlink:title="domain-member: p_cor_entityParty to p_bus_specifiedAccountingMethodStructure in link_bus_specifiedAccountingMethodStructure" order="17"/>
    <!-- p_cor_entityParty to targetRole link_bus_assignedAccountant -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_assignedAccountant" xlink:label="p_bus_assignedAccountant" xlink:title="p_bus_assignedAccountant Assigned_ Accountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_assignedAccountant" xlink:from="p_cor_entityParty" xlink:to="p_bus_assignedAccountant" xlink:title="domain-member: p_cor_entityParty to p_bus_assignedAccountant in link_bus_assignedAccountant" order="18"/>
    <!-- p_cor_entityParty to targetRole link_bus_specifiedReportingCalendar -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_specifiedReportingCalendar" xlink:label="p_bus_specifiedReportingCalendar" xlink:title="p_bus_specifiedReportingCalendar Specified_ Reporting Calendar"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_specifiedReportingCalendar" xlink:from="p_cor_entityParty" xlink:to="p_bus_specifiedReportingCalendar" xlink:title="domain-member: p_cor_entityParty to p_bus_specifiedReportingCalendar in link_bus_specifiedReportingCalendar" order="19"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyPhone">
    <!-- p_bus_entityPartyPhone all (has-hypercube) h_bus_entityPartyPhone link_bus_entityPartyPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyPhone" xlink:label="p_bus_entityPartyPhone" xlink:title="p_bus_entityPartyPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyPhone" xlink:label="h_bus_entityPartyPhone" xlink:title="h_bus_entityPartyPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyPhone" xlink:to="h_bus_entityPartyPhone" xlink:title="all (has-hypercube): p_bus_entityPartyPhone to h_bus_entityPartyPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyPhone" xlink:label="d_bus_entityPartyPhone" xlink:title="d_bus_entityPartyPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyPhone" xlink:to="d_bus_entityPartyPhone" xlink:title="hypercube-dimension: h_bus_entityPartyPhone to d_bus_entityPartyPhone" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyPhoneNumber" xlink:label="bus_entityPartyPhoneNumber" xlink:title="bus_entityPartyPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyPhone" xlink:to="bus_entityPartyPhoneNumber" xlink:title="domain-member: p_bus_entityPartyPhone to bus_entityPartyPhoneNumber Phone Number" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyPhoneNumberDescription" xlink:label="bus_entityPartyPhoneNumberDescription" xlink:title="bus_entityPartyPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyPhone" xlink:to="bus_entityPartyPhoneNumberDescription" xlink:title="domain-member: p_bus_entityPartyPhone to bus_entityPartyPhoneNumberDescription Phone Number Description" order="4"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyFax">
    <!-- p_bus_entityPartyFax all (has-hypercube) h_bus_entityPartyFax link_bus_entityPartyFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyFax" xlink:label="p_bus_entityPartyFax" xlink:title="p_bus_entityPartyFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyFax" xlink:label="h_bus_entityPartyFax" xlink:title="h_bus_entityPartyFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyFax" xlink:to="h_bus_entityPartyFax" xlink:title="all (has-hypercube): p_bus_entityPartyFax to h_bus_entityPartyFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyFax" xlink:label="d_bus_entityPartyFax" xlink:title="d_bus_entityPartyFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyFax" xlink:to="d_bus_entityPartyFax" xlink:title="hypercube-dimension: h_bus_entityPartyFax to d_bus_entityPartyFax" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyFaxNumber" xlink:label="bus_entityPartyFaxNumber" xlink:title="bus_entityPartyFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyFax" xlink:to="bus_entityPartyFaxNumber" xlink:title="domain-member: p_bus_entityPartyFax to bus_entityPartyFaxNumber Fax Number" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyFaxNumberUsage" xlink:label="bus_entityPartyFaxNumberUsage" xlink:title="bus_entityPartyFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyFax" xlink:to="bus_entityPartyFaxNumberUsage" xlink:title="domain-member: p_bus_entityPartyFax to bus_entityPartyFaxNumberUsage Fax Number Usage" order="4"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyEmail">
    <!-- p_bus_entityPartyEmail all (has-hypercube) h_bus_entityPartyEmail link_bus_entityPartyEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyEmail" xlink:label="p_bus_entityPartyEmail" xlink:title="p_bus_entityPartyEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyEmail" xlink:label="h_bus_entityPartyEmail" xlink:title="h_bus_entityPartyEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyEmail" xlink:to="h_bus_entityPartyEmail" xlink:title="all (has-hypercube): p_bus_entityPartyEmail to h_bus_entityPartyEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyEmail" xlink:label="d_bus_entityPartyEmail" xlink:title="d_bus_entityPartyEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyEmail" xlink:to="d_bus_entityPartyEmail" xlink:title="hypercube-dimension: h_bus_entityPartyEmail to d_bus_entityPartyEmail" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyEmailAddress" xlink:label="bus_entityPartyEmailAddress" xlink:title="bus_entityPartyEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyEmail" xlink:to="bus_entityPartyEmailAddress" xlink:title="domain-member: p_bus_entityPartyEmail to bus_entityPartyEmailAddress Email Address" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyEmailAddressUsage" xlink:label="bus_entityPartyEmailAddressUsage" xlink:title="bus_entityPartyEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyEmail" xlink:to="bus_entityPartyEmailAddressUsage" xlink:title="domain-member: p_bus_entityPartyEmail to bus_entityPartyEmailAddressUsage Email Address Usage" order="4"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_organizationIdentifier">
    <!-- p_bus_organizationIdentifier all (has-hypercube) h_bus_organizationIdentifier link_bus_organizationIdentifier -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_organizationIdentifier" xlink:label="p_bus_organizationIdentifier" xlink:title="p_bus_organizationIdentifier"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_organizationIdentifier" xlink:label="h_bus_organizationIdentifier" xlink:title="h_bus_organizationIdentifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_organizationIdentifier" xlink:to="h_bus_organizationIdentifier" xlink:title="all (has-hypercube): p_bus_organizationIdentifier to h_bus_organizationIdentifier" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_organizationIdentifier" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_organizationIdentifier to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_organizationIdentifier" xlink:label="d_bus_organizationIdentifier" xlink:title="d_bus_organizationIdentifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_organizationIdentifier" xlink:to="d_bus_organizationIdentifier" xlink:title="hypercube-dimension: h_bus_organizationIdentifier to d_bus_organizationIdentifier" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_organizationIdentifierCode" xlink:label="bus_organizationIdentifierCode" xlink:title="bus_organizationIdentifierCode Organization Identifier Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_organizationIdentifier" xlink:to="bus_organizationIdentifierCode" xlink:title="domain-member: p_bus_organizationIdentifier to bus_organizationIdentifierCode Organization Identifier Code" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_organizationIdentifierPurpose" xlink:label="bus_organizationIdentifierPurpose" xlink:title="bus_organizationIdentifierPurpose Organization Identifier Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_organizationIdentifier" xlink:to="bus_organizationIdentifierPurpose" xlink:title="domain-member: p_bus_organizationIdentifier to bus_organizationIdentifierPurpose Organization Identifier Purpose" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_organizationIdentifierIssuingAgency" xlink:label="bus_organizationIdentifierIssuingAgency" xlink:title="bus_organizationIdentifierIssuingAgency Organization Identifier Issuing Agency"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_organizationIdentifier" xlink:to="bus_organizationIdentifierIssuingAgency" xlink:title="domain-member: p_bus_organizationIdentifier to bus_organizationIdentifierIssuingAgency Organization Identifier Issuing Agency" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_organizationIdentifierDescription" xlink:label="bus_organizationIdentifierDescription" xlink:title="bus_organizationIdentifierDescription Organization Identifier Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_organizationIdentifier" xlink:to="bus_organizationIdentifierDescription" xlink:title="domain-member: p_bus_organizationIdentifier to bus_organizationIdentifierDescription Organization Identifier Description" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyAddress">
    <!-- p_bus_entityPartyAddress all (has-hypercube) h_bus_entityPartyAddress link_bus_entityPartyAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyAddress" xlink:label="p_bus_entityPartyAddress" xlink:title="p_bus_entityPartyAddress"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyAddress" xlink:label="h_bus_entityPartyAddress" xlink:title="h_bus_entityPartyAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyAddress" xlink:to="h_bus_entityPartyAddress" xlink:title="all (has-hypercube): p_bus_entityPartyAddress to h_bus_entityPartyAddress" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyAddress" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyAddress to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyAddress" xlink:label="d_bus_entityPartyAddress" xlink:title="d_bus_entityPartyAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyAddress" xlink:to="d_bus_entityPartyAddress" xlink:title="hypercube-dimension: h_bus_entityPartyAddress to d_bus_entityPartyAddress" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressName" xlink:label="bus_entityPartyAddressName" xlink:title="bus_entityPartyAddressName Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressName" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressName Name" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressDescription" xlink:label="bus_entityPartyAddressDescription" xlink:title="bus_entityPartyAddressDescription Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressDescription" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressDescription Description" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressPurpose" xlink:label="bus_entityPartyAddressPurpose" xlink:title="bus_entityPartyAddressPurpose Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressPurpose" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressPurpose Purpose" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressLocationId" xlink:label="bus_entityPartyAddressLocationId" xlink:title="bus_entityPartyAddressLocationId Location ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressLocationId" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressLocationId Location ID" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressBuildingNumber" xlink:label="bus_entityPartyAddressBuildingNumber" xlink:title="bus_entityPartyAddressBuildingNumber Building Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressBuildingNumber" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressBuildingNumber Building Number" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressStreet" xlink:label="bus_entityPartyAddressStreet" xlink:title="bus_entityPartyAddressStreet Street"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressStreet" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressStreet Street" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressDetail" xlink:label="bus_entityPartyAddressDetail" xlink:title="bus_entityPartyAddressDetail Address Detail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressDetail" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressDetail Address Detail" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressCity" xlink:label="bus_entityPartyAddressCity" xlink:title="bus_entityPartyAddressCity City"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressCity" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressCity City" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressStateOrProvince" xlink:label="bus_entityPartyAddressStateOrProvince" xlink:title="bus_entityPartyAddressStateOrProvince State or Province"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressStateOrProvince" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressStateOrProvince State or Province" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressCountry" xlink:label="bus_entityPartyAddressCountry" xlink:title="bus_entityPartyAddressCountry Country"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressCountry" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressCountry Country" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressZipOrPostalCode" xlink:label="bus_entityPartyAddressZipOrPostalCode" xlink:title="bus_entityPartyAddressZipOrPostalCode Zip or Postal Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressZipOrPostalCode" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressZipOrPostalCode Zip or Postal Code" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyAddressActiveIndicator" xlink:label="bus_entityPartyAddressActiveIndicator" xlink:title="bus_entityPartyAddressActiveIndicator Active Indicator"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyAddress" xlink:to="bus_entityPartyAddressActiveIndicator" xlink:title="domain-member: p_bus_entityPartyAddress to bus_entityPartyAddressActiveIndicator Active Indicator" order="14"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyWebSite">
    <!-- p_bus_entityPartyWebSite all (has-hypercube) h_bus_entityPartyWebSite link_bus_entityPartyWebSite -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyWebSite" xlink:label="p_bus_entityPartyWebSite" xlink:title="p_bus_entityPartyWebSite"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyWebSite" xlink:label="h_bus_entityPartyWebSite" xlink:title="h_bus_entityPartyWebSite"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyWebSite" xlink:to="h_bus_entityPartyWebSite" xlink:title="all (has-hypercube): p_bus_entityPartyWebSite to h_bus_entityPartyWebSite" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyWebSite" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyWebSite to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyWebSite" xlink:label="d_bus_entityPartyWebSite" xlink:title="d_bus_entityPartyWebSite"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyWebSite" xlink:to="d_bus_entityPartyWebSite" xlink:title="hypercube-dimension: h_bus_entityPartyWebSite to d_bus_entityPartyWebSite" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyWebSiteUrl" xlink:label="bus_entityPartyWebSiteUrl" xlink:title="bus_entityPartyWebSiteUrl Web Site URL"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyWebSite" xlink:to="bus_entityPartyWebSiteUrl" xlink:title="domain-member: p_bus_entityPartyWebSite to bus_entityPartyWebSiteUrl Web Site URL" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyWebSiteDescription" xlink:label="bus_entityPartyWebSiteDescription" xlink:title="bus_entityPartyWebSiteDescription Web Site Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyWebSite" xlink:to="bus_entityPartyWebSiteDescription" xlink:title="domain-member: p_bus_entityPartyWebSite to bus_entityPartyWebSiteDescription Web Site Description" order="4"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContact">
    <!-- p_bus_entityPartyContact all (has-hypercube) h_bus_entityPartyContact link_bus_entityPartyContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContact" xlink:label="p_bus_entityPartyContact" xlink:title="p_bus_entityPartyContact"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyContact" xlink:label="h_bus_entityPartyContact" xlink:title="h_bus_entityPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyContact" xlink:to="h_bus_entityPartyContact" xlink:title="all (has-hypercube): p_bus_entityPartyContact to h_bus_entityPartyContact" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContact" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyContact to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContact" xlink:label="d_bus_entityPartyContact" xlink:title="d_bus_entityPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContact" xlink:to="d_bus_entityPartyContact" xlink:title="hypercube-dimension: h_bus_entityPartyContact to d_bus_entityPartyContact" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactPrefix" xlink:label="bus_entityPartyContactPrefix" xlink:title="bus_entityPartyContactPrefix Contact Prefix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactPrefix" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactPrefix Contact Prefix" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactLastName" xlink:label="bus_entityPartyContactLastName" xlink:title="bus_entityPartyContactLastName Contact Last Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactLastName" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactLastName Contact Last Name" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactFirstName" xlink:label="bus_entityPartyContactFirstName" xlink:title="bus_entityPartyContactFirstName Contact First Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactFirstName" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactFirstName Contact First Name" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactSuffix" xlink:label="bus_entityPartyContactSuffix" xlink:title="bus_entityPartyContactSuffix Contact Suffix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactSuffix" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactSuffix Contact Suffix" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactAttentionLine" xlink:label="bus_entityPartyContactAttentionLine" xlink:title="bus_entityPartyContactAttentionLine Contact Attention Line"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactAttentionLine" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactAttentionLine Contact Attention Line" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactPositionRole" xlink:label="bus_entityPartyContactPositionRole" xlink:title="bus_entityPartyContactPositionRole Contact Position Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactPositionRole" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactPositionRole Contact Position Role" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactContactType" xlink:label="bus_entityPartyContactContactType" xlink:title="bus_entityPartyContactContactType Contact Contact Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactContactType" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactContactType Contact Contact Type" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactLocationIdCrossReference" xlink:label="bus_entityPartyContactLocationIdCrossReference" xlink:title="bus_entityPartyContactLocationIdCrossReference Contact Location ID cross reference"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactLocationIdCrossReference" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactLocationIdCrossReference Contact Location ID cross reference" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactActive" xlink:label="bus_entityPartyContactActive" xlink:title="bus_entityPartyContactActive Contact Active"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContact" xlink:to="bus_entityPartyContactActive" xlink:title="domain-member: p_bus_entityPartyContact to bus_entityPartyContactActive Contact Active" order="11"/>
    <!-- p_bus_entityPartyContact to targetRole link_bus_entityPartyContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContactPhone" xlink:label="p_bus_entityPartyContactPhone" xlink:title="p_bus_entityPartyContactPhone Contact_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactPhone" xlink:from="p_bus_entityPartyContact" xlink:to="p_bus_entityPartyContactPhone" xlink:title="domain-member: p_bus_entityPartyContact to p_bus_entityPartyContactPhone in link_bus_entityPartyContactPhone" order="12"/>
    <!-- p_bus_entityPartyContact to targetRole link_bus_entityPartyContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContactFax" xlink:label="p_bus_entityPartyContactFax" xlink:title="p_bus_entityPartyContactFax Contact_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactFax" xlink:from="p_bus_entityPartyContact" xlink:to="p_bus_entityPartyContactFax" xlink:title="domain-member: p_bus_entityPartyContact to p_bus_entityPartyContactFax in link_bus_entityPartyContactFax" order="13"/>
    <!-- p_bus_entityPartyContact to targetRole link_bus_entityPartyContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContactEmail" xlink:label="p_bus_entityPartyContactEmail" xlink:title="p_bus_entityPartyContactEmail Contact_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactEmail" xlink:from="p_bus_entityPartyContact" xlink:to="p_bus_entityPartyContactEmail" xlink:title="domain-member: p_bus_entityPartyContact to p_bus_entityPartyContactEmail in link_bus_entityPartyContactEmail" order="14"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactPhone">
    <!-- p_bus_entityPartyContactPhone all (has-hypercube) h_bus_entityPartyContactPhone link_bus_entityPartyContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContactPhone" xlink:label="p_bus_entityPartyContactPhone" xlink:title="p_bus_entityPartyContactPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyContactPhone" xlink:label="h_bus_entityPartyContactPhone" xlink:title="h_bus_entityPartyContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyContactPhone" xlink:to="h_bus_entityPartyContactPhone" xlink:title="all (has-hypercube): p_bus_entityPartyContactPhone to h_bus_entityPartyContactPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyContactPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContact" xlink:label="d_bus_entityPartyContact" xlink:title="d_bus_entityPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactPhone" xlink:to="d_bus_entityPartyContact" xlink:title="hypercube-dimension: h_bus_entityPartyContactPhone to d_bus_entityPartyContact" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContactPhone" xlink:label="d_bus_entityPartyContactPhone" xlink:title="d_bus_entityPartyContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactPhone" xlink:to="d_bus_entityPartyContactPhone" xlink:title="hypercube-dimension: h_bus_entityPartyContactPhone to d_bus_entityPartyContactPhone" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactPhoneNumber" xlink:label="bus_entityPartyContactPhoneNumber" xlink:title="bus_entityPartyContactPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContactPhone" xlink:to="bus_entityPartyContactPhoneNumber" xlink:title="domain-member: p_bus_entityPartyContactPhone to bus_entityPartyContactPhoneNumber Phone Number" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactPhoneNumberDescription" xlink:label="bus_entityPartyContactPhoneNumberDescription" xlink:title="bus_entityPartyContactPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContactPhone" xlink:to="bus_entityPartyContactPhoneNumberDescription" xlink:title="domain-member: p_bus_entityPartyContactPhone to bus_entityPartyContactPhoneNumberDescription Phone Number Description" order="5"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactFax">
    <!-- p_bus_entityPartyContactFax all (has-hypercube) h_bus_entityPartyContactFax link_bus_entityPartyContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContactFax" xlink:label="p_bus_entityPartyContactFax" xlink:title="p_bus_entityPartyContactFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyContactFax" xlink:label="h_bus_entityPartyContactFax" xlink:title="h_bus_entityPartyContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyContactFax" xlink:to="h_bus_entityPartyContactFax" xlink:title="all (has-hypercube): p_bus_entityPartyContactFax to h_bus_entityPartyContactFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyContactFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContact" xlink:label="d_bus_entityPartyContact" xlink:title="d_bus_entityPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactFax" xlink:to="d_bus_entityPartyContact" xlink:title="hypercube-dimension: h_bus_entityPartyContactFax to d_bus_entityPartyContact" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContactFax" xlink:label="d_bus_entityPartyContactFax" xlink:title="d_bus_entityPartyContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactFax" xlink:to="d_bus_entityPartyContactFax" xlink:title="hypercube-dimension: h_bus_entityPartyContactFax to d_bus_entityPartyContactFax" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactFaxNumber" xlink:label="bus_entityPartyContactFaxNumber" xlink:title="bus_entityPartyContactFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContactFax" xlink:to="bus_entityPartyContactFaxNumber" xlink:title="domain-member: p_bus_entityPartyContactFax to bus_entityPartyContactFaxNumber Fax Number" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactFaxNumberUsage" xlink:label="bus_entityPartyContactFaxNumberUsage" xlink:title="bus_entityPartyContactFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContactFax" xlink:to="bus_entityPartyContactFaxNumberUsage" xlink:title="domain-member: p_bus_entityPartyContactFax to bus_entityPartyContactFaxNumberUsage Fax Number Usage" order="5"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_entityPartyContactEmail">
    <!-- p_bus_entityPartyContactEmail all (has-hypercube) h_bus_entityPartyContactEmail link_bus_entityPartyContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_entityPartyContactEmail" xlink:label="p_bus_entityPartyContactEmail" xlink:title="p_bus_entityPartyContactEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_entityPartyContactEmail" xlink:label="h_bus_entityPartyContactEmail" xlink:title="h_bus_entityPartyContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_entityPartyContactEmail" xlink:to="h_bus_entityPartyContactEmail" xlink:title="all (has-hypercube): p_bus_entityPartyContactEmail to h_bus_entityPartyContactEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_entityPartyContactEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContact" xlink:label="d_bus_entityPartyContact" xlink:title="d_bus_entityPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactEmail" xlink:to="d_bus_entityPartyContact" xlink:title="hypercube-dimension: h_bus_entityPartyContactEmail to d_bus_entityPartyContact" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_entityPartyContactEmail" xlink:label="d_bus_entityPartyContactEmail" xlink:title="d_bus_entityPartyContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_entityPartyContactEmail" xlink:to="d_bus_entityPartyContactEmail" xlink:title="hypercube-dimension: h_bus_entityPartyContactEmail to d_bus_entityPartyContactEmail" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactEmailAddress" xlink:label="bus_entityPartyContactEmailAddress" xlink:title="bus_entityPartyContactEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContactEmail" xlink:to="bus_entityPartyContactEmailAddress" xlink:title="domain-member: p_bus_entityPartyContactEmail to bus_entityPartyContactEmailAddress Email Address" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_entityPartyContactEmailAddressUsage" xlink:label="bus_entityPartyContactEmailAddressUsage" xlink:title="bus_entityPartyContactEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_entityPartyContactEmail" xlink:to="bus_entityPartyContactEmailAddressUsage" xlink:title="domain-member: p_bus_entityPartyContactEmail to bus_entityPartyContactEmailAddressUsage Email Address Usage" order="5"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_specifiedAccountingMethodStructure">
    <!-- p_bus_specifiedAccountingMethodStructure all (has-hypercube) h_bus_specifiedAccountingMethodStructure link_bus_specifiedAccountingMethodStructure -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_specifiedAccountingMethodStructure" xlink:label="p_bus_specifiedAccountingMethodStructure" xlink:title="p_bus_specifiedAccountingMethodStructure"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_specifiedAccountingMethodStructure" xlink:label="h_bus_specifiedAccountingMethodStructure" xlink:title="h_bus_specifiedAccountingMethodStructure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="h_bus_specifiedAccountingMethodStructure" xlink:title="all (has-hypercube): p_bus_specifiedAccountingMethodStructure to h_bus_specifiedAccountingMethodStructure" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_specifiedAccountingMethodStructure" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_specifiedAccountingMethodStructure to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_specifiedAccountingMethodStructure" xlink:label="d_bus_specifiedAccountingMethodStructure" xlink:title="d_bus_specifiedAccountingMethodStructure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_specifiedAccountingMethodStructure" xlink:to="d_bus_specifiedAccountingMethodStructure" xlink:title="hypercube-dimension: h_bus_specifiedAccountingMethodStructure to d_bus_specifiedAccountingMethodStructure" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountingMethod" xlink:label="bus_accountingMethod" xlink:title="bus_accountingMethod Accounting Method"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="bus_accountingMethod" xlink:title="domain-member: p_bus_specifiedAccountingMethodStructure to bus_accountingMethod Accounting Method" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountingMethodDescription" xlink:label="bus_accountingMethodDescription" xlink:title="bus_accountingMethodDescription Accounting Method Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="bus_accountingMethodDescription" xlink:title="domain-member: p_bus_specifiedAccountingMethodStructure to bus_accountingMethodDescription Accounting Method Description" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountingMethodPurpose" xlink:label="bus_accountingMethodPurpose" xlink:title="bus_accountingMethodPurpose Accounting Method Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="bus_accountingMethodPurpose" xlink:title="domain-member: p_bus_specifiedAccountingMethodStructure to bus_accountingMethodPurpose Accounting Method Purpose" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountingMethodPurposeDescription" xlink:label="bus_accountingMethodPurposeDescription" xlink:title="bus_accountingMethodPurposeDescription Accounting Method Purpose Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="bus_accountingMethodPurposeDescription" xlink:title="domain-member: p_bus_specifiedAccountingMethodStructure to bus_accountingMethodPurposeDescription Accounting Method Purpose Description" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountingMethodStartDate" xlink:label="bus_accountingMethodStartDate" xlink:title="bus_accountingMethodStartDate Accounting Method Start Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="bus_accountingMethodStartDate" xlink:title="domain-member: p_bus_specifiedAccountingMethodStructure to bus_accountingMethodStartDate Accounting Method Start Date" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountingMethodEndDate" xlink:label="bus_accountingMethodEndDate" xlink:title="bus_accountingMethodEndDate Accounting Method End Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedAccountingMethodStructure" xlink:to="bus_accountingMethodEndDate" xlink:title="domain-member: p_bus_specifiedAccountingMethodStructure to bus_accountingMethodEndDate Accounting Method End Date" order="8"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_assignedAccountant">
    <!-- p_bus_assignedAccountant all (has-hypercube) h_bus_assignedAccountant link_bus_assignedAccountant -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_assignedAccountant" xlink:label="p_bus_assignedAccountant" xlink:title="p_bus_assignedAccountant"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_assignedAccountant" xlink:label="h_bus_assignedAccountant" xlink:title="h_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_assignedAccountant" xlink:to="h_bus_assignedAccountant" xlink:title="all (has-hypercube): p_bus_assignedAccountant to h_bus_assignedAccountant" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_assignedAccountant" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_assignedAccountant to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_assignedAccountant" xlink:label="d_bus_assignedAccountant" xlink:title="d_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_assignedAccountant" xlink:to="d_bus_assignedAccountant" xlink:title="hypercube-dimension: h_bus_assignedAccountant to d_bus_assignedAccountant" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantName" xlink:label="bus_accountantName" xlink:title="bus_accountantName Accountant Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_assignedAccountant" xlink:to="bus_accountantName" xlink:title="domain-member: p_bus_assignedAccountant to bus_accountantName Accountant Name" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantTypeOfEngagement" xlink:label="bus_accountantTypeOfEngagement" xlink:title="bus_accountantTypeOfEngagement Accountant Type of Engagement"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_assignedAccountant" xlink:to="bus_accountantTypeOfEngagement" xlink:title="domain-member: p_bus_assignedAccountant to bus_accountantTypeOfEngagement Accountant Type of Engagement" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantTypeOfEngagementDescription" xlink:label="bus_accountantTypeOfEngagementDescription" xlink:title="bus_accountantTypeOfEngagementDescription Accountant Type of Engagement Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_assignedAccountant" xlink:to="bus_accountantTypeOfEngagementDescription" xlink:title="domain-member: p_bus_assignedAccountant to bus_accountantTypeOfEngagementDescription Accountant Type of Engagement Description" order="5"/>
    <!-- p_bus_assignedAccountant to targetRole link_bus_accountantAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantAddress" xlink:label="p_bus_accountantAddress" xlink:title="p_bus_accountantAddress Accountant_ Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantAddress" xlink:from="p_bus_assignedAccountant" xlink:to="p_bus_accountantAddress" xlink:title="domain-member: p_bus_assignedAccountant to p_bus_accountantAddress in link_bus_accountantAddress" order="6"/>
    <!-- p_bus_assignedAccountant to targetRole link_bus_accountantContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContact" xlink:label="p_bus_accountantContact" xlink:title="p_bus_accountantContact Accountant_ Contact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContact" xlink:from="p_bus_assignedAccountant" xlink:to="p_bus_accountantContact" xlink:title="domain-member: p_bus_assignedAccountant to p_bus_accountantContact in link_bus_accountantContact" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantAddress">
    <!-- p_bus_accountantAddress all (has-hypercube) h_bus_accountantAddress link_bus_accountantAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantAddress" xlink:label="p_bus_accountantAddress" xlink:title="p_bus_accountantAddress"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_accountantAddress" xlink:label="h_bus_accountantAddress" xlink:title="h_bus_accountantAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_accountantAddress" xlink:to="h_bus_accountantAddress" xlink:title="all (has-hypercube): p_bus_accountantAddress to h_bus_accountantAddress" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantAddress" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_accountantAddress to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_assignedAccountant" xlink:label="d_bus_assignedAccountant" xlink:title="d_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantAddress" xlink:to="d_bus_assignedAccountant" xlink:title="hypercube-dimension: h_bus_accountantAddress to d_bus_assignedAccountant" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantAddress" xlink:label="d_bus_accountantAddress" xlink:title="d_bus_accountantAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantAddress" xlink:to="d_bus_accountantAddress" xlink:title="hypercube-dimension: h_bus_accountantAddress to d_bus_accountantAddress" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressName" xlink:label="bus_accountantAddressName" xlink:title="bus_accountantAddressName Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressName" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressName Name" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressDescription" xlink:label="bus_accountantAddressDescription" xlink:title="bus_accountantAddressDescription Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressDescription" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressDescription Description" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressPurpose" xlink:label="bus_accountantAddressPurpose" xlink:title="bus_accountantAddressPurpose Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressPurpose" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressPurpose Purpose" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressLocationId" xlink:label="bus_accountantAddressLocationId" xlink:title="bus_accountantAddressLocationId Location ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressLocationId" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressLocationId Location ID" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressBuildingNumber" xlink:label="bus_accountantAddressBuildingNumber" xlink:title="bus_accountantAddressBuildingNumber Building Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressBuildingNumber" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressBuildingNumber Building Number" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressStreet" xlink:label="bus_accountantAddressStreet" xlink:title="bus_accountantAddressStreet Street"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressStreet" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressStreet Street" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressDetail" xlink:label="bus_accountantAddressDetail" xlink:title="bus_accountantAddressDetail Address Detail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressDetail" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressDetail Address Detail" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressCity" xlink:label="bus_accountantAddressCity" xlink:title="bus_accountantAddressCity City"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressCity" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressCity City" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressStateOrProvince" xlink:label="bus_accountantAddressStateOrProvince" xlink:title="bus_accountantAddressStateOrProvince State or Province"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressStateOrProvince" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressStateOrProvince State or Province" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressCountry" xlink:label="bus_accountantAddressCountry" xlink:title="bus_accountantAddressCountry Country"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressCountry" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressCountry Country" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressZipOrPostalCode" xlink:label="bus_accountantAddressZipOrPostalCode" xlink:title="bus_accountantAddressZipOrPostalCode Zip or Postal Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressZipOrPostalCode" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressZipOrPostalCode Zip or Postal Code" order="14"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantAddressActiveIndicator" xlink:label="bus_accountantAddressActiveIndicator" xlink:title="bus_accountantAddressActiveIndicator Active Indicator"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantAddress" xlink:to="bus_accountantAddressActiveIndicator" xlink:title="domain-member: p_bus_accountantAddress to bus_accountantAddressActiveIndicator Active Indicator" order="15"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContact">
    <!-- p_bus_accountantContact all (has-hypercube) h_bus_accountantContact link_bus_accountantContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContact" xlink:label="p_bus_accountantContact" xlink:title="p_bus_accountantContact"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_accountantContact" xlink:label="h_bus_accountantContact" xlink:title="h_bus_accountantContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_accountantContact" xlink:to="h_bus_accountantContact" xlink:title="all (has-hypercube): p_bus_accountantContact to h_bus_accountantContact" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContact" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_accountantContact to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_assignedAccountant" xlink:label="d_bus_assignedAccountant" xlink:title="d_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContact" xlink:to="d_bus_assignedAccountant" xlink:title="hypercube-dimension: h_bus_accountantContact to d_bus_assignedAccountant" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContact" xlink:label="d_bus_accountantContact" xlink:title="d_bus_accountantContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContact" xlink:to="d_bus_accountantContact" xlink:title="hypercube-dimension: h_bus_accountantContact to d_bus_accountantContact" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactPrefix" xlink:label="bus_accountantContactPrefix" xlink:title="bus_accountantContactPrefix Contact Prefix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactPrefix" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactPrefix Contact Prefix" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactLastName" xlink:label="bus_accountantContactLastName" xlink:title="bus_accountantContactLastName Contact Last Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactLastName" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactLastName Contact Last Name" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactFirstName" xlink:label="bus_accountantContactFirstName" xlink:title="bus_accountantContactFirstName Contact First Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactFirstName" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactFirstName Contact First Name" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactSuffix" xlink:label="bus_accountantContactSuffix" xlink:title="bus_accountantContactSuffix Contact Suffix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactSuffix" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactSuffix Contact Suffix" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactAttentionLine" xlink:label="bus_accountantContactAttentionLine" xlink:title="bus_accountantContactAttentionLine Contact Attention Line"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactAttentionLine" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactAttentionLine Contact Attention Line" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactPositionRole" xlink:label="bus_accountantContactPositionRole" xlink:title="bus_accountantContactPositionRole Contact Position Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactPositionRole" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactPositionRole Contact Position Role" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactContactType" xlink:label="bus_accountantContactContactType" xlink:title="bus_accountantContactContactType Contact Contact Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactContactType" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactContactType Contact Contact Type" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactLocationIdCrossReference" xlink:label="bus_accountantContactLocationIdCrossReference" xlink:title="bus_accountantContactLocationIdCrossReference Contact Location ID cross reference"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactLocationIdCrossReference" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactLocationIdCrossReference Contact Location ID cross reference" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactActive" xlink:label="bus_accountantContactActive" xlink:title="bus_accountantContactActive Contact Active"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContact" xlink:to="bus_accountantContactActive" xlink:title="domain-member: p_bus_accountantContact to bus_accountantContactActive Contact Active" order="12"/>
    <!-- p_bus_accountantContact to targetRole link_bus_accountantContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContactPhone" xlink:label="p_bus_accountantContactPhone" xlink:title="p_bus_accountantContactPhone Contact_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactPhone" xlink:from="p_bus_accountantContact" xlink:to="p_bus_accountantContactPhone" xlink:title="domain-member: p_bus_accountantContact to p_bus_accountantContactPhone in link_bus_accountantContactPhone" order="13"/>
    <!-- p_bus_accountantContact to targetRole link_bus_accountantContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContactFax" xlink:label="p_bus_accountantContactFax" xlink:title="p_bus_accountantContactFax Contact_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactFax" xlink:from="p_bus_accountantContact" xlink:to="p_bus_accountantContactFax" xlink:title="domain-member: p_bus_accountantContact to p_bus_accountantContactFax in link_bus_accountantContactFax" order="14"/>
    <!-- p_bus_accountantContact to targetRole link_bus_accountantContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContactEmail" xlink:label="p_bus_accountantContactEmail" xlink:title="p_bus_accountantContactEmail Contact_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactEmail" xlink:from="p_bus_accountantContact" xlink:to="p_bus_accountantContactEmail" xlink:title="domain-member: p_bus_accountantContact to p_bus_accountantContactEmail in link_bus_accountantContactEmail" order="15"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactPhone">
    <!-- p_bus_accountantContactPhone all (has-hypercube) h_bus_accountantContactPhone link_bus_accountantContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContactPhone" xlink:label="p_bus_accountantContactPhone" xlink:title="p_bus_accountantContactPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_accountantContactPhone" xlink:label="h_bus_accountantContactPhone" xlink:title="h_bus_accountantContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_accountantContactPhone" xlink:to="h_bus_accountantContactPhone" xlink:title="all (has-hypercube): p_bus_accountantContactPhone to h_bus_accountantContactPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_accountantContactPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_assignedAccountant" xlink:label="d_bus_assignedAccountant" xlink:title="d_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactPhone" xlink:to="d_bus_assignedAccountant" xlink:title="hypercube-dimension: h_bus_accountantContactPhone to d_bus_assignedAccountant" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContact" xlink:label="d_bus_accountantContact" xlink:title="d_bus_accountantContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactPhone" xlink:to="d_bus_accountantContact" xlink:title="hypercube-dimension: h_bus_accountantContactPhone to d_bus_accountantContact" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContactPhone" xlink:label="d_bus_accountantContactPhone" xlink:title="d_bus_accountantContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactPhone" xlink:to="d_bus_accountantContactPhone" xlink:title="hypercube-dimension: h_bus_accountantContactPhone to d_bus_accountantContactPhone" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactPhoneNumber" xlink:label="bus_accountantContactPhoneNumber" xlink:title="bus_accountantContactPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContactPhone" xlink:to="bus_accountantContactPhoneNumber" xlink:title="domain-member: p_bus_accountantContactPhone to bus_accountantContactPhoneNumber Phone Number" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactPhoneNumberDescription" xlink:label="bus_accountantContactPhoneNumberDescription" xlink:title="bus_accountantContactPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContactPhone" xlink:to="bus_accountantContactPhoneNumberDescription" xlink:title="domain-member: p_bus_accountantContactPhone to bus_accountantContactPhoneNumberDescription Phone Number Description" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactFax">
    <!-- p_bus_accountantContactFax all (has-hypercube) h_bus_accountantContactFax link_bus_accountantContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContactFax" xlink:label="p_bus_accountantContactFax" xlink:title="p_bus_accountantContactFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_accountantContactFax" xlink:label="h_bus_accountantContactFax" xlink:title="h_bus_accountantContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_accountantContactFax" xlink:to="h_bus_accountantContactFax" xlink:title="all (has-hypercube): p_bus_accountantContactFax to h_bus_accountantContactFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_accountantContactFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_assignedAccountant" xlink:label="d_bus_assignedAccountant" xlink:title="d_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactFax" xlink:to="d_bus_assignedAccountant" xlink:title="hypercube-dimension: h_bus_accountantContactFax to d_bus_assignedAccountant" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContact" xlink:label="d_bus_accountantContact" xlink:title="d_bus_accountantContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactFax" xlink:to="d_bus_accountantContact" xlink:title="hypercube-dimension: h_bus_accountantContactFax to d_bus_accountantContact" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContactFax" xlink:label="d_bus_accountantContactFax" xlink:title="d_bus_accountantContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactFax" xlink:to="d_bus_accountantContactFax" xlink:title="hypercube-dimension: h_bus_accountantContactFax to d_bus_accountantContactFax" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactFaxNumber" xlink:label="bus_accountantContactFaxNumber" xlink:title="bus_accountantContactFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContactFax" xlink:to="bus_accountantContactFaxNumber" xlink:title="domain-member: p_bus_accountantContactFax to bus_accountantContactFaxNumber Fax Number" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactFaxNumberUsage" xlink:label="bus_accountantContactFaxNumberUsage" xlink:title="bus_accountantContactFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContactFax" xlink:to="bus_accountantContactFaxNumberUsage" xlink:title="domain-member: p_bus_accountantContactFax to bus_accountantContactFaxNumberUsage Fax Number Usage" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_accountantContactEmail">
    <!-- p_bus_accountantContactEmail all (has-hypercube) h_bus_accountantContactEmail link_bus_accountantContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_accountantContactEmail" xlink:label="p_bus_accountantContactEmail" xlink:title="p_bus_accountantContactEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_accountantContactEmail" xlink:label="h_bus_accountantContactEmail" xlink:title="h_bus_accountantContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_accountantContactEmail" xlink:to="h_bus_accountantContactEmail" xlink:title="all (has-hypercube): p_bus_accountantContactEmail to h_bus_accountantContactEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_accountantContactEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_assignedAccountant" xlink:label="d_bus_assignedAccountant" xlink:title="d_bus_assignedAccountant"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactEmail" xlink:to="d_bus_assignedAccountant" xlink:title="hypercube-dimension: h_bus_accountantContactEmail to d_bus_assignedAccountant" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContact" xlink:label="d_bus_accountantContact" xlink:title="d_bus_accountantContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactEmail" xlink:to="d_bus_accountantContact" xlink:title="hypercube-dimension: h_bus_accountantContactEmail to d_bus_accountantContact" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_accountantContactEmail" xlink:label="d_bus_accountantContactEmail" xlink:title="d_bus_accountantContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_accountantContactEmail" xlink:to="d_bus_accountantContactEmail" xlink:title="hypercube-dimension: h_bus_accountantContactEmail to d_bus_accountantContactEmail" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactEmailAddress" xlink:label="bus_accountantContactEmailAddress" xlink:title="bus_accountantContactEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContactEmail" xlink:to="bus_accountantContactEmailAddress" xlink:title="domain-member: p_bus_accountantContactEmail to bus_accountantContactEmailAddress Email Address" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_accountantContactEmailAddressUsage" xlink:label="bus_accountantContactEmailAddressUsage" xlink:title="bus_accountantContactEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_accountantContactEmail" xlink:to="bus_accountantContactEmailAddressUsage" xlink:title="domain-member: p_bus_accountantContactEmail to bus_accountantContactEmailAddressUsage Email Address Usage" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_specifiedReportingCalendar">
    <!-- p_bus_specifiedReportingCalendar all (has-hypercube) h_bus_specifiedReportingCalendar link_bus_specifiedReportingCalendar -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_specifiedReportingCalendar" xlink:label="p_bus_specifiedReportingCalendar" xlink:title="p_bus_specifiedReportingCalendar"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_specifiedReportingCalendar" xlink:label="h_bus_specifiedReportingCalendar" xlink:title="h_bus_specifiedReportingCalendar"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="h_bus_specifiedReportingCalendar" xlink:title="all (has-hypercube): p_bus_specifiedReportingCalendar to h_bus_specifiedReportingCalendar" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_specifiedReportingCalendar" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_specifiedReportingCalendar to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_specifiedReportingCalendar" xlink:label="d_bus_specifiedReportingCalendar" xlink:title="d_bus_specifiedReportingCalendar"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_specifiedReportingCalendar" xlink:to="d_bus_specifiedReportingCalendar" xlink:title="hypercube-dimension: h_bus_specifiedReportingCalendar to d_bus_specifiedReportingCalendar" order="2"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarCode" xlink:label="bus_reportingCalendarCode" xlink:title="bus_reportingCalendarCode Reporting Calendar Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarCode" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarCode Reporting Calendar Code" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarDescription" xlink:label="bus_reportingCalendarDescription" xlink:title="bus_reportingCalendarDescription Reporting Calendar Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarDescription" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarDescription Reporting Calendar Description" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarTitle" xlink:label="bus_reportingCalendarTitle" xlink:title="bus_reportingCalendarTitle Reporting Calendar Title"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarTitle" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarTitle Reporting Calendar Title" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarPeriodType" xlink:label="bus_reportingCalendarPeriodType" xlink:title="bus_reportingCalendarPeriodType Reporting Calendar Period Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarPeriodType" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarPeriodType Reporting Calendar Period Type" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarPeriodTypeDescription" xlink:label="bus_reportingCalendarPeriodTypeDescription" xlink:title="bus_reportingCalendarPeriodTypeDescription Reporting Calendar Period Type Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarPeriodTypeDescription" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarPeriodTypeDescription Reporting Calendar Period Type Description" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarClosedStatus" xlink:label="bus_reportingCalendarClosedStatus" xlink:title="bus_reportingCalendarClosedStatus Reporting Calendar Closed Status"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarClosedStatus" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarClosedStatus Reporting Calendar Closed Status" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarPurpose" xlink:label="bus_reportingCalendarPurpose" xlink:title="bus_reportingCalendarPurpose Reporting Calendar Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarPurpose" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarPurpose Reporting Calendar Purpose" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_reportingCalendarPurposeDescription" xlink:label="bus_reportingCalendarPurposeDescription" xlink:title="bus_reportingCalendarPurposeDescription Reporting Calendar Purpose Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="bus_reportingCalendarPurposeDescription" xlink:title="domain-member: p_bus_specifiedReportingCalendar to bus_reportingCalendarPurposeDescription Reporting Calendar Purpose Description" order="10"/>
    <!-- p_bus_specifiedReportingCalendar to targetRole link_bus_reportingCalendarPeriod -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_reportingCalendarPeriod" xlink:label="p_bus_reportingCalendarPeriod" xlink:title="p_bus_reportingCalendarPeriod Reporting Calendar_ Period"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_reportingCalendarPeriod" xlink:from="p_bus_specifiedReportingCalendar" xlink:to="p_bus_reportingCalendarPeriod" xlink:title="domain-member: p_bus_specifiedReportingCalendar to p_bus_reportingCalendarPeriod in link_bus_reportingCalendarPeriod" order="11"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_reportingCalendarPeriod">
    <!-- p_bus_reportingCalendarPeriod all (has-hypercube) h_bus_reportingCalendarPeriod link_bus_reportingCalendarPeriod -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_reportingCalendarPeriod" xlink:label="p_bus_reportingCalendarPeriod" xlink:title="p_bus_reportingCalendarPeriod"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_reportingCalendarPeriod" xlink:label="h_bus_reportingCalendarPeriod" xlink:title="h_bus_reportingCalendarPeriod"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_reportingCalendarPeriod" xlink:to="h_bus_reportingCalendarPeriod" xlink:title="all (has-hypercube): p_bus_reportingCalendarPeriod to h_bus_reportingCalendarPeriod" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_reportingCalendarPeriod" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_reportingCalendarPeriod to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_specifiedReportingCalendar" xlink:label="d_bus_specifiedReportingCalendar" xlink:title="d_bus_specifiedReportingCalendar"/>
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    <!-- p_btx_transactionHeader all (has-hypercube) h_btx_transactionHeader link_btx_transactionHeader -->
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    <!-- hypercube-dimension -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionHeader" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_transactionHeader to d_btx_businessTransactions" order="1"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionHeader" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_transactionHeader to d_btx_transactionHeader" order="2"/>
    <!-- domain-member -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_datePosted" xlink:title="domain-member: p_btx_transactionHeader to btx_datePosted Date Posted" order="3"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_creator" xlink:label="btx_creator" xlink:title="btx_creator Creator"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_creator" xlink:title="domain-member: p_btx_transactionHeader to btx_creator Creator" order="4"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_lastModifier" xlink:title="domain-member: p_btx_transactionHeader to btx_lastModifier Last Modifier" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_enteredDate" xlink:label="btx_enteredDate" xlink:title="btx_enteredDate Entered Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_enteredDate" xlink:title="domain-member: p_btx_transactionHeader to btx_enteredDate Entered Date" order="6"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_responsiblePerson" xlink:title="domain-member: p_btx_transactionHeader to btx_responsiblePerson Responsible Person" order="7"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_comment" xlink:title="domain-member: p_btx_transactionHeader to btx_comment Comment" order="11"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerEntryNumberCounter" xlink:title="domain-member: p_btx_transactionHeader to btx_headerEntryNumberCounter Header Entry Number Counter" order="12"/>
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    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerDocumentTypeDescription" xlink:label="btx_headerDocumentTypeDescription" xlink:title="btx_headerDocumentTypeDescription Header Document Type Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerDocumentTypeDescription" xlink:title="domain-member: p_btx_transactionHeader to btx_headerDocumentTypeDescription Header Document Type Description" order="14"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerInvoiceType" xlink:title="domain-member: p_btx_transactionHeader to btx_headerInvoiceType Header Invoice Type" order="15"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_documentCurrencyCode" xlink:title="domain-member: p_btx_transactionHeader to btx_documentCurrencyCode Document Currency Code" order="16"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_taxAccountingCurrencyCode" xlink:title="domain-member: p_btx_transactionHeader to btx_taxAccountingCurrencyCode Tax Accounting Currency Code" order="17"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerDocumentNumber" xlink:label="btx_headerDocumentNumber" xlink:title="btx_headerDocumentNumber Header Document Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerDocumentNumber" xlink:title="domain-member: p_btx_transactionHeader to btx_headerDocumentNumber Header Document Number" order="18"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPaymentMethod" xlink:label="btx_headerPaymentMethod" xlink:title="btx_headerPaymentMethod Header Payment Method"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerPaymentMethod" xlink:title="domain-member: p_btx_transactionHeader to btx_headerPaymentMethod Header Payment Method" order="19"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPostingStatus" xlink:label="btx_headerPostingStatus" xlink:title="btx_headerPostingStatus Header Posting Status"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerPostingStatus" xlink:title="domain-member: p_btx_transactionHeader to btx_headerPostingStatus Header Posting Status" order="20"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPostingStatusDescription" xlink:label="btx_headerPostingStatusDescription" xlink:title="btx_headerPostingStatusDescription Header Posting Status Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerPostingStatusDescription" xlink:title="domain-member: p_btx_transactionHeader to btx_headerPostingStatusDescription Header Posting Status Description" order="21"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerAcknowledgementDate" xlink:title="domain-member: p_btx_transactionHeader to btx_headerAcknowledgementDate Header Acknowledgement Date" order="22"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerConfirmationDate" xlink:title="domain-member: p_btx_transactionHeader to btx_headerConfirmationDate Header Confirmation Date" order="23"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerShipFrom" xlink:title="domain-member: p_btx_transactionHeader to btx_headerShipFrom Header Ship From" order="24"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerDateShippedReceived" xlink:label="btx_headerDateShippedReceived" xlink:title="btx_headerDateShippedReceived Header Date Shipped/Received"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerDateShippedReceived" xlink:title="domain-member: p_btx_transactionHeader to btx_headerDateShippedReceived Header Date Shipped/Received" order="25"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerMaturityDateOrDateDue" xlink:label="btx_headerMaturityDateOrDateDue" xlink:title="btx_headerMaturityDateOrDateDue Header Maturity Date or Date Due"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerMaturityDateOrDateDue" xlink:title="domain-member: p_btx_transactionHeader to btx_headerMaturityDateOrDateDue Header Maturity Date or Date Due" order="26"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPaymentTerms" xlink:label="btx_headerPaymentTerms" xlink:title="btx_headerPaymentTerms Header Payment Terms"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_headerPaymentTerms" xlink:title="domain-member: p_btx_transactionHeader to btx_headerPaymentTerms Header Payment Terms" order="27"/>
    <!-- p_btx_transactionHeader to targetRole link_btx_headerAdjustment -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerAdjustment" xlink:from="p_btx_transactionHeader" xlink:to="p_btx_headerAdjustment" xlink:title="domain-member: p_btx_transactionHeader to p_btx_headerAdjustment in link_btx_headerAdjustment" order="28"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeader" xlink:to="btx_appliedInvoiceReferencedDocumentNumber" xlink:title="domain-member: p_btx_transactionHeader to btx_appliedInvoiceReferencedDocumentNumber Document Number" order="29"/>
    <!-- p_btx_transactionHeader to targetRole link_btx_transactionHeaderReferencedDocument -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionHeaderReferencedDocument" xlink:from="p_btx_transactionHeader" xlink:to="p_btx_transactionHeaderReferencedDocument" xlink:title="domain-member: p_btx_transactionHeader to p_btx_transactionHeaderReferencedDocument in link_btx_transactionHeaderReferencedDocument" order="31"/>
    <!-- p_btx_transactionHeader to targetRole link_btx_headerParty -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerParty" xlink:label="p_btx_headerParty" xlink:title="p_btx_headerParty Header_ Party"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerParty" xlink:from="p_btx_transactionHeader" xlink:to="p_btx_headerParty" xlink:title="domain-member: p_btx_transactionHeader to p_btx_headerParty in link_btx_headerParty" order="32"/>
    <!-- p_btx_transactionHeader to targetRole link_btx_headerAmountStructure -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerAmountStructure" xlink:label="p_btx_headerAmountStructure" xlink:title="p_btx_headerAmountStructure Header_ Amount Structure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerAmountStructure" xlink:from="p_btx_transactionHeader" xlink:to="p_btx_headerAmountStructure" xlink:title="domain-member: p_btx_transactionHeader to p_btx_headerAmountStructure in link_btx_headerAmountStructure" order="33"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerTax" xlink:from="p_btx_transactionHeader" xlink:to="p_btx_headerTax" xlink:title="domain-member: p_btx_transactionHeader to p_btx_headerTax in link_btx_headerTax" order="34"/>
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    <!-- p_btx_headerAdjustment all (has-hypercube) h_btx_headerAdjustment link_btx_headerAdjustment -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerAdjustment" xlink:label="p_btx_headerAdjustment" xlink:title="p_btx_headerAdjustment"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_headerAdjustment" xlink:label="h_btx_headerAdjustment" xlink:title="h_btx_headerAdjustment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_headerAdjustment" xlink:to="h_btx_headerAdjustment" xlink:title="all (has-hypercube): p_btx_headerAdjustment to h_btx_headerAdjustment" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerAdjustment" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_headerAdjustment to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerAdjustment" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_headerAdjustment to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerAdjustment" xlink:label="d_btx_headerAdjustment" xlink:title="d_btx_headerAdjustment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerAdjustment" xlink:to="d_btx_headerAdjustment" xlink:title="hypercube-dimension: h_btx_headerAdjustment to d_btx_headerAdjustment" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentType" xlink:label="btx_headerAdjustmentType" xlink:title="btx_headerAdjustmentType Adjustment Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentType" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentType Adjustment Type" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentAmount" xlink:label="btx_headerAdjustmentAmount" xlink:title="btx_headerAdjustmentAmount Amount"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentAmount" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentAmount Amount" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentBaseAmount" xlink:label="btx_headerAdjustmentBaseAmount" xlink:title="btx_headerAdjustmentBaseAmount Base Amount"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentBaseAmount" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentBaseAmount Base Amount" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentPercentage" xlink:label="btx_headerAdjustmentPercentage" xlink:title="btx_headerAdjustmentPercentage Percentage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentPercentage" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentPercentage Percentage" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentReason" xlink:label="btx_headerAdjustmentReason" xlink:title="btx_headerAdjustmentReason Reason"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentReason" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentReason Reason" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentReasonCode" xlink:label="btx_headerAdjustmentReasonCode" xlink:title="btx_headerAdjustmentReasonCode Reason Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentReasonCode" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentReasonCode Reason Code" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentTaxCategory" xlink:label="btx_headerAdjustmentTaxCategory" xlink:title="btx_headerAdjustmentTaxCategory Tax Category"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentTaxCategory" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentTaxCategory Tax Category" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAdjustmentTaxRate" xlink:label="btx_headerAdjustmentTaxRate" xlink:title="btx_headerAdjustmentTaxRate Tax Rate"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAdjustment" xlink:to="btx_headerAdjustmentTaxRate" xlink:title="domain-member: p_btx_headerAdjustment to btx_headerAdjustmentTaxRate Tax Rate" order="11"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionHeaderReferencedDocument">
    <!-- p_btx_transactionHeaderReferencedDocument all (has-hypercube) h_btx_transactionHeaderReferencedDocument link_btx_transactionHeaderReferencedDocument -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_transactionHeaderReferencedDocument" xlink:label="p_btx_transactionHeaderReferencedDocument" xlink:title="p_btx_transactionHeaderReferencedDocument"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_transactionHeaderReferencedDocument" xlink:label="h_btx_transactionHeaderReferencedDocument" xlink:title="h_btx_transactionHeaderReferencedDocument"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="h_btx_transactionHeaderReferencedDocument" xlink:title="all (has-hypercube): p_btx_transactionHeaderReferencedDocument to h_btx_transactionHeaderReferencedDocument" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionHeaderReferencedDocument" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_transactionHeaderReferencedDocument to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionHeaderReferencedDocument" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_transactionHeaderReferencedDocument to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeaderReferencedDocument" xlink:label="d_btx_transactionHeaderReferencedDocument" xlink:title="d_btx_transactionHeaderReferencedDocument"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionHeaderReferencedDocument" xlink:to="d_btx_transactionHeaderReferencedDocument" xlink:title="hypercube-dimension: h_btx_transactionHeaderReferencedDocument to d_btx_transactionHeaderReferencedDocument" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentType" xlink:label="btx_transactionHeaderReferencedDocumentType" xlink:title="btx_transactionHeaderReferencedDocumentType Document Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentType" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentType Document Type" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentNumber" xlink:label="btx_transactionHeaderReferencedDocumentNumber" xlink:title="btx_transactionHeaderReferencedDocumentNumber Document Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentNumber" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentNumber Document Number" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentDate" xlink:label="btx_transactionHeaderReferencedDocumentDate" xlink:title="btx_transactionHeaderReferencedDocumentDate Document Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentDate" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentDate Document Date" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentIdentifierType" xlink:label="btx_transactionHeaderReferencedDocumentIdentifierType" xlink:title="btx_transactionHeaderReferencedDocumentIdentifierType Document Identifier Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentIdentifierType" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentIdentifierType Document Identifier Type" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentIdentifierCode" xlink:label="btx_transactionHeaderReferencedDocumentIdentifierCode" xlink:title="btx_transactionHeaderReferencedDocumentIdentifierCode Document Identifier Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentIdentifierCode" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentIdentifierCode Document Identifier Code" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentReceivedDate" xlink:label="btx_transactionHeaderReferencedDocumentReceivedDate" xlink:title="btx_transactionHeaderReferencedDocumentReceivedDate Received Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentReceivedDate" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentReceivedDate Received Date" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentLocation" xlink:label="btx_transactionHeaderReferencedDocumentLocation" xlink:title="btx_transactionHeaderReferencedDocumentLocation Document Location"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentLocation" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentLocation Document Location" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionHeaderReferencedDocumentReferencePurpose" xlink:label="btx_transactionHeaderReferencedDocumentReferencePurpose" xlink:title="btx_transactionHeaderReferencedDocumentReferencePurpose Reference Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionHeaderReferencedDocument" xlink:to="btx_transactionHeaderReferencedDocumentReferencePurpose" xlink:title="domain-member: p_btx_transactionHeaderReferencedDocument to btx_transactionHeaderReferencedDocumentReferencePurpose Reference Purpose" order="11"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerParty">
    <!-- p_btx_headerParty all (has-hypercube) h_btx_headerParty link_btx_headerParty -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerParty" xlink:label="p_btx_headerParty" xlink:title="p_btx_headerParty"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_headerParty" xlink:label="h_btx_headerParty" xlink:title="h_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_headerParty" xlink:to="h_btx_headerParty" xlink:title="all (has-hypercube): p_btx_headerParty to h_btx_headerParty" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerParty" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_headerParty to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerParty" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_headerParty to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerParty" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_btx_headerParty to d_btx_headerParty" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyName" xlink:label="btx_headerPartyName" xlink:title="btx_headerPartyName Party Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerParty" xlink:to="btx_headerPartyName" xlink:title="domain-member: p_btx_headerParty to btx_headerPartyName Party Name" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyId" xlink:label="btx_headerPartyId" xlink:title="btx_headerPartyId Party ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerParty" xlink:to="btx_headerPartyId" xlink:title="domain-member: p_btx_headerParty to btx_headerPartyId Party ID" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyRole" xlink:label="btx_headerPartyRole" xlink:title="btx_headerPartyRole Party Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerParty" xlink:to="btx_headerPartyRole" xlink:title="domain-member: p_btx_headerParty to btx_headerPartyRole Party Role" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyBusinessDescription" xlink:label="btx_headerPartyBusinessDescription" xlink:title="btx_headerPartyBusinessDescription Party Business Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerParty" xlink:to="btx_headerPartyBusinessDescription" xlink:title="domain-member: p_btx_headerParty to btx_headerPartyBusinessDescription Party Business Description" order="7"/>
    <!-- p_btx_headerParty to targetRole link_bus_headerPartyPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyPhone" xlink:label="p_bus_headerPartyPhone" xlink:title="p_bus_headerPartyPhone Party_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyPhone" xlink:from="p_btx_headerParty" xlink:to="p_bus_headerPartyPhone" xlink:title="domain-member: p_btx_headerParty to p_bus_headerPartyPhone in link_bus_headerPartyPhone" order="8"/>
    <!-- p_btx_headerParty to targetRole link_bus_headerPartyFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyFax" xlink:label="p_bus_headerPartyFax" xlink:title="p_bus_headerPartyFax Party_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyFax" xlink:from="p_btx_headerParty" xlink:to="p_bus_headerPartyFax" xlink:title="domain-member: p_btx_headerParty to p_bus_headerPartyFax in link_bus_headerPartyFax" order="9"/>
    <!-- p_btx_headerParty to targetRole link_bus_headerPartyEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyEmail" xlink:label="p_bus_headerPartyEmail" xlink:title="p_bus_headerPartyEmail Party_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyEmail" xlink:from="p_btx_headerParty" xlink:to="p_bus_headerPartyEmail" xlink:title="domain-member: p_btx_headerParty to p_bus_headerPartyEmail in link_bus_headerPartyEmail" order="10"/>
    <!-- p_btx_headerParty to targetRole link_bus_headerPartyAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyAddress" xlink:label="p_bus_headerPartyAddress" xlink:title="p_bus_headerPartyAddress Party_ Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyAddress" xlink:from="p_btx_headerParty" xlink:to="p_bus_headerPartyAddress" xlink:title="domain-member: p_btx_headerParty to p_bus_headerPartyAddress in link_bus_headerPartyAddress" order="11"/>
    <!-- p_btx_headerParty to targetRole link_bus_headerPartyWebSite -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyWebSite" xlink:label="p_bus_headerPartyWebSite" xlink:title="p_bus_headerPartyWebSite Party_ Web Site"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyWebSite" xlink:from="p_btx_headerParty" xlink:to="p_bus_headerPartyWebSite" xlink:title="domain-member: p_btx_headerParty to p_bus_headerPartyWebSite in link_bus_headerPartyWebSite" order="12"/>
    <!-- p_btx_headerParty to targetRole link_bus_headerPartyContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContact" xlink:label="p_bus_headerPartyContact" xlink:title="p_bus_headerPartyContact Party_ Contact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContact" xlink:from="p_btx_headerParty" xlink:to="p_bus_headerPartyContact" xlink:title="domain-member: p_btx_headerParty to p_bus_headerPartyContact in link_bus_headerPartyContact" order="13"/>
    <!-- p_btx_headerParty to targetRole link_btx_headerPartyOrganizationIdentifier -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerPartyOrganizationIdentifier" xlink:label="p_btx_headerPartyOrganizationIdentifier" xlink:title="p_btx_headerPartyOrganizationIdentifier Organization Identifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerPartyOrganizationIdentifier" xlink:from="p_btx_headerParty" xlink:to="p_btx_headerPartyOrganizationIdentifier" xlink:title="domain-member: p_btx_headerParty to p_btx_headerPartyOrganizationIdentifier in link_btx_headerPartyOrganizationIdentifier" order="14"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyPhone">
    <!-- p_bus_headerPartyPhone all (has-hypercube) h_bus_headerPartyPhone link_bus_headerPartyPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyPhone" xlink:label="p_bus_headerPartyPhone" xlink:title="p_bus_headerPartyPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyPhone" xlink:label="h_bus_headerPartyPhone" xlink:title="h_bus_headerPartyPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyPhone" xlink:to="h_bus_headerPartyPhone" xlink:title="all (has-hypercube): p_bus_headerPartyPhone to h_bus_headerPartyPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyPhone" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyPhone to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyPhone" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyPhone to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyPhone" xlink:label="d_bus_headerPartyPhone" xlink:title="d_bus_headerPartyPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyPhone" xlink:to="d_bus_headerPartyPhone" xlink:title="hypercube-dimension: h_bus_headerPartyPhone to d_bus_headerPartyPhone" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyPhoneNumber" xlink:label="bus_headerPartyPhoneNumber" xlink:title="bus_headerPartyPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyPhone" xlink:to="bus_headerPartyPhoneNumber" xlink:title="domain-member: p_bus_headerPartyPhone to bus_headerPartyPhoneNumber Phone Number" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyPhoneNumberDescription" xlink:label="bus_headerPartyPhoneNumberDescription" xlink:title="bus_headerPartyPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyPhone" xlink:to="bus_headerPartyPhoneNumberDescription" xlink:title="domain-member: p_bus_headerPartyPhone to bus_headerPartyPhoneNumberDescription Phone Number Description" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyFax">
    <!-- p_bus_headerPartyFax all (has-hypercube) h_bus_headerPartyFax link_bus_headerPartyFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyFax" xlink:label="p_bus_headerPartyFax" xlink:title="p_bus_headerPartyFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyFax" xlink:label="h_bus_headerPartyFax" xlink:title="h_bus_headerPartyFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyFax" xlink:to="h_bus_headerPartyFax" xlink:title="all (has-hypercube): p_bus_headerPartyFax to h_bus_headerPartyFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyFax" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyFax to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyFax" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyFax to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyFax" xlink:label="d_bus_headerPartyFax" xlink:title="d_bus_headerPartyFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyFax" xlink:to="d_bus_headerPartyFax" xlink:title="hypercube-dimension: h_bus_headerPartyFax to d_bus_headerPartyFax" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyFaxNumber" xlink:label="bus_headerPartyFaxNumber" xlink:title="bus_headerPartyFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyFax" xlink:to="bus_headerPartyFaxNumber" xlink:title="domain-member: p_bus_headerPartyFax to bus_headerPartyFaxNumber Fax Number" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyFaxNumberUsage" xlink:label="bus_headerPartyFaxNumberUsage" xlink:title="bus_headerPartyFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyFax" xlink:to="bus_headerPartyFaxNumberUsage" xlink:title="domain-member: p_bus_headerPartyFax to bus_headerPartyFaxNumberUsage Fax Number Usage" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyEmail">
    <!-- p_bus_headerPartyEmail all (has-hypercube) h_bus_headerPartyEmail link_bus_headerPartyEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyEmail" xlink:label="p_bus_headerPartyEmail" xlink:title="p_bus_headerPartyEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyEmail" xlink:label="h_bus_headerPartyEmail" xlink:title="h_bus_headerPartyEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyEmail" xlink:to="h_bus_headerPartyEmail" xlink:title="all (has-hypercube): p_bus_headerPartyEmail to h_bus_headerPartyEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyEmail" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyEmail to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyEmail" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyEmail to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyEmail" xlink:label="d_bus_headerPartyEmail" xlink:title="d_bus_headerPartyEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyEmail" xlink:to="d_bus_headerPartyEmail" xlink:title="hypercube-dimension: h_bus_headerPartyEmail to d_bus_headerPartyEmail" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyEmailAddress" xlink:label="bus_headerPartyEmailAddress" xlink:title="bus_headerPartyEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyEmail" xlink:to="bus_headerPartyEmailAddress" xlink:title="domain-member: p_bus_headerPartyEmail to bus_headerPartyEmailAddress Email Address" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyEmailAddressUsage" xlink:label="bus_headerPartyEmailAddressUsage" xlink:title="bus_headerPartyEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyEmail" xlink:to="bus_headerPartyEmailAddressUsage" xlink:title="domain-member: p_bus_headerPartyEmail to bus_headerPartyEmailAddressUsage Email Address Usage" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyAddress">
    <!-- p_bus_headerPartyAddress all (has-hypercube) h_bus_headerPartyAddress link_bus_headerPartyAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyAddress" xlink:label="p_bus_headerPartyAddress" xlink:title="p_bus_headerPartyAddress"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyAddress" xlink:label="h_bus_headerPartyAddress" xlink:title="h_bus_headerPartyAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyAddress" xlink:to="h_bus_headerPartyAddress" xlink:title="all (has-hypercube): p_bus_headerPartyAddress to h_bus_headerPartyAddress" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyAddress" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyAddress to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyAddress" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyAddress to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyAddress" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyAddress to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyAddress" xlink:label="d_bus_headerPartyAddress" xlink:title="d_bus_headerPartyAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyAddress" xlink:to="d_bus_headerPartyAddress" xlink:title="hypercube-dimension: h_bus_headerPartyAddress to d_bus_headerPartyAddress" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressName" xlink:label="bus_headerPartyAddressName" xlink:title="bus_headerPartyAddressName Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressName" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressName Name" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressDescription" xlink:label="bus_headerPartyAddressDescription" xlink:title="bus_headerPartyAddressDescription Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressDescription" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressDescription Description" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressPurpose" xlink:label="bus_headerPartyAddressPurpose" xlink:title="bus_headerPartyAddressPurpose Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressPurpose" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressPurpose Purpose" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressLocationId" xlink:label="bus_headerPartyAddressLocationId" xlink:title="bus_headerPartyAddressLocationId Location ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressLocationId" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressLocationId Location ID" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressBuildingNumber" xlink:label="bus_headerPartyAddressBuildingNumber" xlink:title="bus_headerPartyAddressBuildingNumber Building Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressBuildingNumber" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressBuildingNumber Building Number" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressStreet" xlink:label="bus_headerPartyAddressStreet" xlink:title="bus_headerPartyAddressStreet Street"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressStreet" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressStreet Street" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressDetail" xlink:label="bus_headerPartyAddressDetail" xlink:title="bus_headerPartyAddressDetail Address Detail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressDetail" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressDetail Address Detail" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressCity" xlink:label="bus_headerPartyAddressCity" xlink:title="bus_headerPartyAddressCity City"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressCity" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressCity City" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressStateOrProvince" xlink:label="bus_headerPartyAddressStateOrProvince" xlink:title="bus_headerPartyAddressStateOrProvince State or Province"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressStateOrProvince" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressStateOrProvince State or Province" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressCountry" xlink:label="bus_headerPartyAddressCountry" xlink:title="bus_headerPartyAddressCountry Country"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressCountry" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressCountry Country" order="14"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressZipOrPostalCode" xlink:label="bus_headerPartyAddressZipOrPostalCode" xlink:title="bus_headerPartyAddressZipOrPostalCode Zip or Postal Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressZipOrPostalCode" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressZipOrPostalCode Zip or Postal Code" order="15"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyAddressActiveIndicator" xlink:label="bus_headerPartyAddressActiveIndicator" xlink:title="bus_headerPartyAddressActiveIndicator Active Indicator"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyAddress" xlink:to="bus_headerPartyAddressActiveIndicator" xlink:title="domain-member: p_bus_headerPartyAddress to bus_headerPartyAddressActiveIndicator Active Indicator" order="16"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyWebSite">
    <!-- p_bus_headerPartyWebSite all (has-hypercube) h_bus_headerPartyWebSite link_bus_headerPartyWebSite -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyWebSite" xlink:label="p_bus_headerPartyWebSite" xlink:title="p_bus_headerPartyWebSite"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyWebSite" xlink:label="h_bus_headerPartyWebSite" xlink:title="h_bus_headerPartyWebSite"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyWebSite" xlink:to="h_bus_headerPartyWebSite" xlink:title="all (has-hypercube): p_bus_headerPartyWebSite to h_bus_headerPartyWebSite" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyWebSite" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyWebSite to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyWebSite" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyWebSite to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyWebSite" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyWebSite to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyWebSite" xlink:label="d_bus_headerPartyWebSite" xlink:title="d_bus_headerPartyWebSite"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyWebSite" xlink:to="d_bus_headerPartyWebSite" xlink:title="hypercube-dimension: h_bus_headerPartyWebSite to d_bus_headerPartyWebSite" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyWebSiteUrl" xlink:label="bus_headerPartyWebSiteUrl" xlink:title="bus_headerPartyWebSiteUrl Web Site URL"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyWebSite" xlink:to="bus_headerPartyWebSiteUrl" xlink:title="domain-member: p_bus_headerPartyWebSite to bus_headerPartyWebSiteUrl Web Site URL" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyWebSiteDescription" xlink:label="bus_headerPartyWebSiteDescription" xlink:title="bus_headerPartyWebSiteDescription Web Site Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyWebSite" xlink:to="bus_headerPartyWebSiteDescription" xlink:title="domain-member: p_bus_headerPartyWebSite to bus_headerPartyWebSiteDescription Web Site Description" order="6"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContact">
    <!-- p_bus_headerPartyContact all (has-hypercube) h_bus_headerPartyContact link_bus_headerPartyContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContact" xlink:label="p_bus_headerPartyContact" xlink:title="p_bus_headerPartyContact"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyContact" xlink:label="h_bus_headerPartyContact" xlink:title="h_bus_headerPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyContact" xlink:to="h_bus_headerPartyContact" xlink:title="all (has-hypercube): p_bus_headerPartyContact to h_bus_headerPartyContact" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContact" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyContact to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContact" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyContact to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContact" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyContact to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContact" xlink:label="d_bus_headerPartyContact" xlink:title="d_bus_headerPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContact" xlink:to="d_bus_headerPartyContact" xlink:title="hypercube-dimension: h_bus_headerPartyContact to d_bus_headerPartyContact" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactPrefix" xlink:label="bus_headerPartyContactPrefix" xlink:title="bus_headerPartyContactPrefix Contact Prefix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactPrefix" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactPrefix Contact Prefix" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactLastName" xlink:label="bus_headerPartyContactLastName" xlink:title="bus_headerPartyContactLastName Contact Last Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactLastName" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactLastName Contact Last Name" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactFirstName" xlink:label="bus_headerPartyContactFirstName" xlink:title="bus_headerPartyContactFirstName Contact First Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactFirstName" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactFirstName Contact First Name" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactSuffix" xlink:label="bus_headerPartyContactSuffix" xlink:title="bus_headerPartyContactSuffix Contact Suffix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactSuffix" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactSuffix Contact Suffix" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactAttentionLine" xlink:label="bus_headerPartyContactAttentionLine" xlink:title="bus_headerPartyContactAttentionLine Contact Attention Line"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactAttentionLine" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactAttentionLine Contact Attention Line" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactPositionRole" xlink:label="bus_headerPartyContactPositionRole" xlink:title="bus_headerPartyContactPositionRole Contact Position Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactPositionRole" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactPositionRole Contact Position Role" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactContactType" xlink:label="bus_headerPartyContactContactType" xlink:title="bus_headerPartyContactContactType Contact Contact Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactContactType" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactContactType Contact Contact Type" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactLocationIdCrossReference" xlink:label="bus_headerPartyContactLocationIdCrossReference" xlink:title="bus_headerPartyContactLocationIdCrossReference Contact Location ID cross reference"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactLocationIdCrossReference" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactLocationIdCrossReference Contact Location ID cross reference" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactActive" xlink:label="bus_headerPartyContactActive" xlink:title="bus_headerPartyContactActive Contact Active"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContact" xlink:to="bus_headerPartyContactActive" xlink:title="domain-member: p_bus_headerPartyContact to bus_headerPartyContactActive Contact Active" order="13"/>
    <!-- p_bus_headerPartyContact to targetRole link_bus_headerPartyContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContactPhone" xlink:label="p_bus_headerPartyContactPhone" xlink:title="p_bus_headerPartyContactPhone Contact_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactPhone" xlink:from="p_bus_headerPartyContact" xlink:to="p_bus_headerPartyContactPhone" xlink:title="domain-member: p_bus_headerPartyContact to p_bus_headerPartyContactPhone in link_bus_headerPartyContactPhone" order="14"/>
    <!-- p_bus_headerPartyContact to targetRole link_bus_headerPartyContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContactFax" xlink:label="p_bus_headerPartyContactFax" xlink:title="p_bus_headerPartyContactFax Contact_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactFax" xlink:from="p_bus_headerPartyContact" xlink:to="p_bus_headerPartyContactFax" xlink:title="domain-member: p_bus_headerPartyContact to p_bus_headerPartyContactFax in link_bus_headerPartyContactFax" order="15"/>
    <!-- p_bus_headerPartyContact to targetRole link_bus_headerPartyContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContactEmail" xlink:label="p_bus_headerPartyContactEmail" xlink:title="p_bus_headerPartyContactEmail Contact_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactEmail" xlink:from="p_bus_headerPartyContact" xlink:to="p_bus_headerPartyContactEmail" xlink:title="domain-member: p_bus_headerPartyContact to p_bus_headerPartyContactEmail in link_bus_headerPartyContactEmail" order="16"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactPhone">
    <!-- p_bus_headerPartyContactPhone all (has-hypercube) h_bus_headerPartyContactPhone link_bus_headerPartyContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContactPhone" xlink:label="p_bus_headerPartyContactPhone" xlink:title="p_bus_headerPartyContactPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyContactPhone" xlink:label="h_bus_headerPartyContactPhone" xlink:title="h_bus_headerPartyContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyContactPhone" xlink:to="h_bus_headerPartyContactPhone" xlink:title="all (has-hypercube): p_bus_headerPartyContactPhone to h_bus_headerPartyContactPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyContactPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactPhone" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyContactPhone to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactPhone" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyContactPhone to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContact" xlink:label="d_bus_headerPartyContact" xlink:title="d_bus_headerPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactPhone" xlink:to="d_bus_headerPartyContact" xlink:title="hypercube-dimension: h_bus_headerPartyContactPhone to d_bus_headerPartyContact" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContactPhone" xlink:label="d_bus_headerPartyContactPhone" xlink:title="d_bus_headerPartyContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactPhone" xlink:to="d_bus_headerPartyContactPhone" xlink:title="hypercube-dimension: h_bus_headerPartyContactPhone to d_bus_headerPartyContactPhone" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactPhoneNumber" xlink:label="bus_headerPartyContactPhoneNumber" xlink:title="bus_headerPartyContactPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContactPhone" xlink:to="bus_headerPartyContactPhoneNumber" xlink:title="domain-member: p_bus_headerPartyContactPhone to bus_headerPartyContactPhoneNumber Phone Number" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactPhoneNumberDescription" xlink:label="bus_headerPartyContactPhoneNumberDescription" xlink:title="bus_headerPartyContactPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContactPhone" xlink:to="bus_headerPartyContactPhoneNumberDescription" xlink:title="domain-member: p_bus_headerPartyContactPhone to bus_headerPartyContactPhoneNumberDescription Phone Number Description" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactFax">
    <!-- p_bus_headerPartyContactFax all (has-hypercube) h_bus_headerPartyContactFax link_bus_headerPartyContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContactFax" xlink:label="p_bus_headerPartyContactFax" xlink:title="p_bus_headerPartyContactFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyContactFax" xlink:label="h_bus_headerPartyContactFax" xlink:title="h_bus_headerPartyContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyContactFax" xlink:to="h_bus_headerPartyContactFax" xlink:title="all (has-hypercube): p_bus_headerPartyContactFax to h_bus_headerPartyContactFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyContactFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactFax" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyContactFax to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactFax" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyContactFax to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContact" xlink:label="d_bus_headerPartyContact" xlink:title="d_bus_headerPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactFax" xlink:to="d_bus_headerPartyContact" xlink:title="hypercube-dimension: h_bus_headerPartyContactFax to d_bus_headerPartyContact" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContactFax" xlink:label="d_bus_headerPartyContactFax" xlink:title="d_bus_headerPartyContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactFax" xlink:to="d_bus_headerPartyContactFax" xlink:title="hypercube-dimension: h_bus_headerPartyContactFax to d_bus_headerPartyContactFax" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactFaxNumber" xlink:label="bus_headerPartyContactFaxNumber" xlink:title="bus_headerPartyContactFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContactFax" xlink:to="bus_headerPartyContactFaxNumber" xlink:title="domain-member: p_bus_headerPartyContactFax to bus_headerPartyContactFaxNumber Fax Number" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactFaxNumberUsage" xlink:label="bus_headerPartyContactFaxNumberUsage" xlink:title="bus_headerPartyContactFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContactFax" xlink:to="bus_headerPartyContactFaxNumberUsage" xlink:title="domain-member: p_bus_headerPartyContactFax to bus_headerPartyContactFaxNumberUsage Fax Number Usage" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_headerPartyContactEmail">
    <!-- p_bus_headerPartyContactEmail all (has-hypercube) h_bus_headerPartyContactEmail link_bus_headerPartyContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_headerPartyContactEmail" xlink:label="p_bus_headerPartyContactEmail" xlink:title="p_bus_headerPartyContactEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_headerPartyContactEmail" xlink:label="h_bus_headerPartyContactEmail" xlink:title="h_bus_headerPartyContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_headerPartyContactEmail" xlink:to="h_bus_headerPartyContactEmail" xlink:title="all (has-hypercube): p_bus_headerPartyContactEmail to h_bus_headerPartyContactEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_headerPartyContactEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactEmail" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_headerPartyContactEmail to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactEmail" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_bus_headerPartyContactEmail to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContact" xlink:label="d_bus_headerPartyContact" xlink:title="d_bus_headerPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactEmail" xlink:to="d_bus_headerPartyContact" xlink:title="hypercube-dimension: h_bus_headerPartyContactEmail to d_bus_headerPartyContact" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_headerPartyContactEmail" xlink:label="d_bus_headerPartyContactEmail" xlink:title="d_bus_headerPartyContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_headerPartyContactEmail" xlink:to="d_bus_headerPartyContactEmail" xlink:title="hypercube-dimension: h_bus_headerPartyContactEmail to d_bus_headerPartyContactEmail" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactEmailAddress" xlink:label="bus_headerPartyContactEmailAddress" xlink:title="bus_headerPartyContactEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContactEmail" xlink:to="bus_headerPartyContactEmailAddress" xlink:title="domain-member: p_bus_headerPartyContactEmail to bus_headerPartyContactEmailAddress Email Address" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_headerPartyContactEmailAddressUsage" xlink:label="bus_headerPartyContactEmailAddressUsage" xlink:title="bus_headerPartyContactEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_headerPartyContactEmail" xlink:to="bus_headerPartyContactEmailAddressUsage" xlink:title="domain-member: p_bus_headerPartyContactEmail to bus_headerPartyContactEmailAddressUsage Email Address Usage" order="7"/>
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    <!-- p_btx_headerPartyOrganizationIdentifier all (has-hypercube) h_btx_headerPartyOrganizationIdentifier link_btx_headerPartyOrganizationIdentifier -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerPartyOrganizationIdentifier" xlink:label="p_btx_headerPartyOrganizationIdentifier" xlink:title="p_btx_headerPartyOrganizationIdentifier"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_headerPartyOrganizationIdentifier" xlink:label="h_btx_headerPartyOrganizationIdentifier" xlink:title="h_btx_headerPartyOrganizationIdentifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_headerPartyOrganizationIdentifier" xlink:to="h_btx_headerPartyOrganizationIdentifier" xlink:title="all (has-hypercube): p_btx_headerPartyOrganizationIdentifier to h_btx_headerPartyOrganizationIdentifier" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerPartyOrganizationIdentifier" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_headerPartyOrganizationIdentifier to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerPartyOrganizationIdentifier" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_headerPartyOrganizationIdentifier to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerParty" xlink:label="d_btx_headerParty" xlink:title="d_btx_headerParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerPartyOrganizationIdentifier" xlink:to="d_btx_headerParty" xlink:title="hypercube-dimension: h_btx_headerPartyOrganizationIdentifier to d_btx_headerParty" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerPartyOrganizationIdentifier" xlink:label="d_btx_headerPartyOrganizationIdentifier" xlink:title="d_btx_headerPartyOrganizationIdentifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerPartyOrganizationIdentifier" xlink:to="d_btx_headerPartyOrganizationIdentifier" xlink:title="hypercube-dimension: h_btx_headerPartyOrganizationIdentifier to d_btx_headerPartyOrganizationIdentifier" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyOrganizationIdentifierCode" xlink:label="btx_headerPartyOrganizationIdentifierCode" xlink:title="btx_headerPartyOrganizationIdentifierCode Organization Identifier Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerPartyOrganizationIdentifier" xlink:to="btx_headerPartyOrganizationIdentifierCode" xlink:title="domain-member: p_btx_headerPartyOrganizationIdentifier to btx_headerPartyOrganizationIdentifierCode Organization Identifier Code" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyOrganizationIdentifierPurpose" xlink:label="btx_headerPartyOrganizationIdentifierPurpose" xlink:title="btx_headerPartyOrganizationIdentifierPurpose Organization Identifier Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerPartyOrganizationIdentifier" xlink:to="btx_headerPartyOrganizationIdentifierPurpose" xlink:title="domain-member: p_btx_headerPartyOrganizationIdentifier to btx_headerPartyOrganizationIdentifierPurpose Organization Identifier Purpose" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyOrganizationIdentifierIssuingAgency" xlink:label="btx_headerPartyOrganizationIdentifierIssuingAgency" xlink:title="btx_headerPartyOrganizationIdentifierIssuingAgency Organization Identifier Issuing Agency"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerPartyOrganizationIdentifier" xlink:to="btx_headerPartyOrganizationIdentifierIssuingAgency" xlink:title="domain-member: p_btx_headerPartyOrganizationIdentifier to btx_headerPartyOrganizationIdentifierIssuingAgency Organization Identifier Issuing Agency" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerPartyOrganizationIdentifierDescription" xlink:label="btx_headerPartyOrganizationIdentifierDescription" xlink:title="btx_headerPartyOrganizationIdentifierDescription Organization Identifier Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerPartyOrganizationIdentifier" xlink:to="btx_headerPartyOrganizationIdentifierDescription" xlink:title="domain-member: p_btx_headerPartyOrganizationIdentifier to btx_headerPartyOrganizationIdentifierDescription Organization Identifier Description" order="8"/>
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  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerAmountStructure">
    <!-- p_btx_headerAmountStructure all (has-hypercube) h_btx_headerAmountStructure link_btx_headerAmountStructure -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerAmountStructure" xlink:label="p_btx_headerAmountStructure" xlink:title="p_btx_headerAmountStructure"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_headerAmountStructure" xlink:label="h_btx_headerAmountStructure" xlink:title="h_btx_headerAmountStructure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_headerAmountStructure" xlink:to="h_btx_headerAmountStructure" xlink:title="all (has-hypercube): p_btx_headerAmountStructure to h_btx_headerAmountStructure" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerAmountStructure" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_headerAmountStructure to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerAmountStructure" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_headerAmountStructure to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerAmountStructure" xlink:label="d_btx_headerAmountStructure" xlink:title="d_btx_headerAmountStructure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerAmountStructure" xlink:to="d_btx_headerAmountStructure" xlink:title="hypercube-dimension: h_btx_headerAmountStructure to d_btx_headerAmountStructure" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAmountStructureAmount" xlink:label="btx_headerAmountStructureAmount" xlink:title="btx_headerAmountStructureAmount Amount"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAmountStructure" xlink:to="btx_headerAmountStructureAmount" xlink:title="domain-member: p_btx_headerAmountStructure to btx_headerAmountStructureAmount Amount" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAmountStructureAmountType" xlink:label="btx_headerAmountStructureAmountType" xlink:title="btx_headerAmountStructureAmountType Amount Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAmountStructure" xlink:to="btx_headerAmountStructureAmountType" xlink:title="domain-member: p_btx_headerAmountStructure to btx_headerAmountStructureAmountType Amount Type" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAmountStructureCurrencyCode" xlink:label="btx_headerAmountStructureCurrencyCode" xlink:title="btx_headerAmountStructureCurrencyCode Currency Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAmountStructure" xlink:to="btx_headerAmountStructureCurrencyCode" xlink:title="domain-member: p_btx_headerAmountStructure to btx_headerAmountStructureCurrencyCode Currency Code" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAmountStructureCurrencyCodeType" xlink:label="btx_headerAmountStructureCurrencyCodeType" xlink:title="btx_headerAmountStructureCurrencyCodeType Currency Code Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAmountStructure" xlink:to="btx_headerAmountStructureCurrencyCodeType" xlink:title="domain-member: p_btx_headerAmountStructure to btx_headerAmountStructureCurrencyCodeType Currency Code Type" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerAmountType" xlink:label="btx_headerAmountType" xlink:title="btx_headerAmountType Header_ Amount Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerAmountStructure" xlink:to="btx_headerAmountType" xlink:title="domain-member: p_btx_headerAmountStructure to btx_headerAmountType Header_ Amount Type" order="8"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_headerTax">
    <!-- p_btx_headerTax all (has-hypercube) h_btx_headerTax link_btx_headerTax -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_headerTax" xlink:label="p_btx_headerTax" xlink:title="p_btx_headerTax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_headerTax" xlink:label="h_btx_headerTax" xlink:title="h_btx_headerTax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_headerTax" xlink:to="h_btx_headerTax" xlink:title="all (has-hypercube): p_btx_headerTax to h_btx_headerTax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerTax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_headerTax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerTax" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_headerTax to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_headerTax" xlink:label="d_btx_headerTax" xlink:title="d_btx_headerTax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_headerTax" xlink:to="d_btx_headerTax" xlink:title="hypercube-dimension: h_btx_headerTax to d_btx_headerTax" order="3"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxAuthority" xlink:label="btx_headerTaxAuthority" xlink:title="btx_headerTaxAuthority Tax Authority"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxAuthority" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxAuthority Tax Authority" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxTableCode" xlink:label="btx_headerTaxTableCode" xlink:title="btx_headerTaxTableCode Tax Table Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxTableCode" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxTableCode Tax Table Code" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxDescription" xlink:label="btx_headerTaxDescription" xlink:title="btx_headerTaxDescription Tax Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxDescription" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxDescription Tax Description" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxAmountOfTaxes" xlink:label="btx_headerTaxAmountOfTaxes" xlink:title="btx_headerTaxAmountOfTaxes Amount of Taxes"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxAmountOfTaxes" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxAmountOfTaxes Amount of Taxes" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxBasisForTaxation" xlink:label="btx_headerTaxBasisForTaxation" xlink:title="btx_headerTaxBasisForTaxation Basis for Taxation"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxBasisForTaxation" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxBasisForTaxation Basis for Taxation" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxPercentageRate" xlink:label="btx_headerTaxPercentageRate" xlink:title="btx_headerTaxPercentageRate Tax Percentage Rate"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxPercentageRate" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxPercentageRate Tax Percentage Rate" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxCategory" xlink:label="btx_headerTaxCategory" xlink:title="btx_headerTaxCategory Tax Category"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxCategory" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxCategory Tax Category" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxCommentExemptionReason" xlink:label="btx_headerTaxCommentExemptionReason" xlink:title="btx_headerTaxCommentExemptionReason Tax Comment/Exemption Reason"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxCommentExemptionReason" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxCommentExemptionReason Tax Comment/Exemption Reason" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxAmountInDocumentCurrency" xlink:label="btx_headerTaxAmountInDocumentCurrency" xlink:title="btx_headerTaxAmountInDocumentCurrency Tax Amount in Document Currency"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxAmountInDocumentCurrency" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxAmountInDocumentCurrency Tax Amount in Document Currency" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxAmountInTaxAccountingCurrency" xlink:label="btx_headerTaxAmountInTaxAccountingCurrency" xlink:title="btx_headerTaxAmountInTaxAccountingCurrency Tax Amount in Tax Accounting Currency"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxAmountInTaxAccountingCurrency" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxAmountInTaxAccountingCurrency Tax Amount in Tax Accounting Currency" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_headerTaxType" xlink:label="btx_headerTaxType" xlink:title="btx_headerTaxType Tax Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_headerTax" xlink:to="btx_headerTaxType" xlink:title="domain-member: p_btx_headerTax to btx_headerTaxType Tax Type" order="14"/>
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  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionDetail">
    <!-- p_btx_transactionDetail all (has-hypercube) h_btx_transactionDetail link_btx_transactionDetail -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_transactionDetail" xlink:label="p_btx_transactionDetail" xlink:title="p_btx_transactionDetail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_transactionDetail" xlink:label="h_btx_transactionDetail" xlink:title="h_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_transactionDetail" xlink:to="h_btx_transactionDetail" xlink:title="all (has-hypercube): p_btx_transactionDetail to h_btx_transactionDetail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionDetail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_transactionDetail to d_btx_businessTransactions" order="1"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionDetail" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_transactionDetail to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_transactionDetail" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_btx_transactionDetail to d_btx_transactionDetail" order="3"/>
    <!-- domain-member -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_lineNumber" xlink:title="domain-member: p_btx_transactionDetail to btx_lineNumber Line Number" order="4"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_lineNumberCounter" xlink:label="btx_lineNumberCounter" xlink:title="btx_lineNumberCounter Line Number Counter"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_lineNumberCounter" xlink:title="domain-member: p_btx_transactionDetail to btx_lineNumberCounter Line Number Counter" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_postingDate" xlink:label="btx_postingDate" xlink:title="btx_postingDate Posting Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_postingDate" xlink:title="domain-member: p_btx_transactionDetail to btx_postingDate Posting Date" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_memoLine" xlink:label="btx_memoLine" xlink:title="btx_memoLine Memo Line"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_memoLine" xlink:title="domain-member: p_btx_transactionDetail to btx_memoLine Memo Line" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionDetailDocumentType" xlink:label="btx_transactionDetailDocumentType" xlink:title="btx_transactionDetailDocumentType Document Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_transactionDetailDocumentType" xlink:title="domain-member: p_btx_transactionDetail to btx_transactionDetailDocumentType Document Type" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_documentTypeDescription" xlink:label="btx_documentTypeDescription" xlink:title="btx_documentTypeDescription Document Type Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_documentTypeDescription" xlink:title="domain-member: p_btx_transactionDetail to btx_documentTypeDescription Document Type Description" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionDetailDocumentDate" xlink:label="btx_transactionDetailDocumentDate" xlink:title="btx_transactionDetailDocumentDate Document Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_transactionDetailDocumentDate" xlink:title="domain-member: p_btx_transactionDetail to btx_transactionDetailDocumentDate Document Date" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionDetailReceivedDate" xlink:label="btx_transactionDetailReceivedDate" xlink:title="btx_transactionDetailReceivedDate Received Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_transactionDetailReceivedDate" xlink:title="domain-member: p_btx_transactionDetail to btx_transactionDetailReceivedDate Received Date" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_transactionDetailDocumentLocation" xlink:label="btx_transactionDetailDocumentLocation" xlink:title="btx_transactionDetailDocumentLocation Document Location"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_transactionDetailDocumentLocation" xlink:title="domain-member: p_btx_transactionDetail to btx_transactionDetailDocumentLocation Document Location" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_postingStatus" xlink:label="btx_postingStatus" xlink:title="btx_postingStatus Posting Status"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_postingStatus" xlink:title="domain-member: p_btx_transactionDetail to btx_postingStatus Posting Status" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_postingStatusDescription" xlink:label="btx_postingStatusDescription" xlink:title="btx_postingStatusDescription Posting Status Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_postingStatusDescription" xlink:title="domain-member: p_btx_transactionDetail to btx_postingStatusDescription Posting Status Description" order="14"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_acknowledgementDate" xlink:label="btx_acknowledgementDate" xlink:title="btx_acknowledgementDate Acknowledgement Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_acknowledgementDate" xlink:title="domain-member: p_btx_transactionDetail to btx_acknowledgementDate Acknowledgement Date" order="15"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_confirmationDate" xlink:label="btx_confirmationDate" xlink:title="btx_confirmationDate Confirmation Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_confirmationDate" xlink:title="domain-member: p_btx_transactionDetail to btx_confirmationDate Confirmation Date" order="16"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_measurableClassId" xlink:label="btx_measurableClassId" xlink:title="btx_measurableClassId Measurable Class ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_measurableClassId" xlink:title="domain-member: p_btx_transactionDetail to btx_measurableClassId Measurable Class ID" order="17"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_measurableClassDescription" xlink:label="btx_measurableClassDescription" xlink:title="btx_measurableClassDescription Measurable Class Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_measurableClassDescription" xlink:title="domain-member: p_btx_transactionDetail to btx_measurableClassDescription Measurable Class Description" order="18"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_geospatialCoordinate" xlink:label="btx_geospatialCoordinate" xlink:title="btx_geospatialCoordinate Geospatial Coordinate"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_geospatialCoordinate" xlink:title="domain-member: p_btx_transactionDetail to btx_geospatialCoordinate Geospatial Coordinate" order="19"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_description" xlink:label="btx_description" xlink:title="btx_description Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="btx_description" xlink:title="domain-member: p_btx_transactionDetail to btx_description Description" order="20"/>
    <link:loc xlink:type="locator" xlink:href="../../cor/cor-oim-2026-12-31.xsd#cor_documentNumber" xlink:label="cor_documentNumber" xlink:title="cor_documentNumber Document Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_transactionDetail" xlink:to="cor_documentNumber" xlink:title="domain-member: p_btx_transactionDetail to cor_documentNumber Document Number" order="21"/>
    <!-- p_btx_transactionDetail to targetRole link_taf_originatingDocument -->
    <link:loc xlink:type="locator" xlink:href="../../taf/taf-oim-2026-12-31.xsd#p_taf_originatingDocument" xlink:label="p_taf_originatingDocument" xlink:title="p_taf_originatingDocument Originating Document"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_taf_originatingDocument" xlink:from="p_btx_transactionDetail" xlink:to="p_taf_originatingDocument" xlink:title="domain-member: p_btx_transactionDetail to p_taf_originatingDocument in link_taf_originatingDocument" order="23"/>
    <!-- p_btx_transactionDetail to targetRole link_btx_detailParty -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailParty" xlink:label="p_btx_detailParty" xlink:title="p_btx_detailParty Detail_ Party"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailParty" xlink:from="p_btx_transactionDetail" xlink:to="p_btx_detailParty" xlink:title="domain-member: p_btx_transactionDetail to p_btx_detailParty in link_btx_detailParty" order="24"/>
    <!-- p_btx_transactionDetail to targetRole link_btx_transactionDetailReferencedDocument -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_transactionDetailReferencedDocument" xlink:label="p_btx_transactionDetailReferencedDocument" xlink:title="p_btx_transactionDetailReferencedDocument Referenced Document"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_transactionDetailReferencedDocument" xlink:from="p_btx_transactionDetail" xlink:to="p_btx_transactionDetailReferencedDocument" xlink:title="domain-member: p_btx_transactionDetail to p_btx_transactionDetailReferencedDocument in link_btx_transactionDetailReferencedDocument" order="25"/>
    <!-- p_btx_transactionDetail to targetRole link_bus_detailMeasurable -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailMeasurable" xlink:label="p_bus_detailMeasurable" xlink:title="p_bus_detailMeasurable Detail_ Measurable"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailMeasurable" xlink:from="p_btx_transactionDetail" xlink:to="p_bus_detailMeasurable" xlink:title="domain-member: p_btx_transactionDetail to p_bus_detailMeasurable in link_bus_detailMeasurable" order="26"/>
    <!-- p_btx_transactionDetail to targetRole link_ehm_detailSerialOrLot -->
    <link:loc xlink:type="locator" xlink:href="../../ehm/ehm-oim-2026-12-31.xsd#p_ehm_detailSerialOrLot" xlink:label="p_ehm_detailSerialOrLot" xlink:title="p_ehm_detailSerialOrLot Detail_ Serial or Lot"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_ehm_detailSerialOrLot" xlink:from="p_btx_transactionDetail" xlink:to="p_ehm_detailSerialOrLot" xlink:title="domain-member: p_btx_transactionDetail to p_ehm_detailSerialOrLot in link_ehm_detailSerialOrLot" order="27"/>
    <!-- p_btx_transactionDetail to targetRole link_bus_detailJob -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailJob" xlink:label="p_bus_detailJob" xlink:title="p_bus_detailJob Detail_ Job"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailJob" xlink:from="p_btx_transactionDetail" xlink:to="p_bus_detailJob" xlink:title="domain-member: p_btx_transactionDetail to p_bus_detailJob in link_bus_detailJob" order="28"/>
    <!-- p_btx_transactionDetail to targetRole link_btx_detailAdjustment -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailAdjustment" xlink:label="p_btx_detailAdjustment" xlink:title="p_btx_detailAdjustment Detail_ Adjustment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailAdjustment" xlink:from="p_btx_transactionDetail" xlink:to="p_btx_detailAdjustment" xlink:title="domain-member: p_btx_transactionDetail to p_btx_detailAdjustment in link_btx_detailAdjustment" order="29"/>
    <!-- p_btx_transactionDetail to targetRole link_btx_detailAmountStructure -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailAmountStructure" xlink:label="p_btx_detailAmountStructure" xlink:title="p_btx_detailAmountStructure Detail_ Amount Structure"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailAmountStructure" xlink:from="p_btx_transactionDetail" xlink:to="p_btx_detailAmountStructure" xlink:title="domain-member: p_btx_transactionDetail to p_btx_detailAmountStructure in link_btx_detailAmountStructure" order="30"/>
    <!-- p_btx_transactionDetail to targetRole link_btx_detailTax -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailTax" xlink:label="p_btx_detailTax" xlink:title="p_btx_detailTax Detail_ Tax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailTax" xlink:from="p_btx_transactionDetail" xlink:to="p_btx_detailTax" xlink:title="domain-member: p_btx_transactionDetail to p_btx_detailTax in link_btx_detailTax" order="31"/>
    <!-- p_btx_transactionDetail to targetRole link_bus_detailDepreciationMortgage -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailDepreciationMortgage" xlink:label="p_bus_detailDepreciationMortgage" xlink:title="p_bus_detailDepreciationMortgage Detail_ Depreciation Mortgage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailDepreciationMortgage" xlink:from="p_btx_transactionDetail" xlink:to="p_bus_detailDepreciationMortgage" xlink:title="domain-member: p_btx_transactionDetail to p_bus_detailDepreciationMortgage in link_bus_detailDepreciationMortgage" order="32"/>
    <!-- p_btx_transactionDetail to targetRole link_lnk_detailRichTextComment -->
    <link:loc xlink:type="locator" xlink:href="../../lnk/lnk-oim-2026-12-31.xsd#p_lnk_detailRichTextComment" xlink:label="p_lnk_detailRichTextComment" xlink:title="p_lnk_detailRichTextComment Detail_ Rich Text Comment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_lnk_detailRichTextComment" xlink:from="p_btx_transactionDetail" xlink:to="p_lnk_detailRichTextComment" xlink:title="domain-member: p_btx_transactionDetail to p_lnk_detailRichTextComment in link_lnk_detailRichTextComment" order="33"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_cor_detailXbrl" xlink:from="p_btx_transactionDetail" xlink:to="p_cor_detailXbrl" xlink:title="domain-member: p_btx_transactionDetail to p_cor_detailXbrl in link_cor_detailXbrl" order="34"/>
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    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_taf_originatingDocument" xlink:label="h_taf_originatingDocument" xlink:title="h_taf_originatingDocument"/>
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    <!-- hypercube-dimension -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_taf_originatingDocument" xlink:to="d_taf_originatingDocument" xlink:title="hypercube-dimension: h_taf_originatingDocument to d_taf_originatingDocument" order="4"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_taf_originatingDocument" xlink:to="taf_documentType" xlink:title="domain-member: p_taf_originatingDocument to taf_documentType Document Type" order="5"/>
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_taf_originatingDocument" xlink:to="taf_documentNumber" xlink:title="domain-member: p_taf_originatingDocument to taf_documentNumber Document Number" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../taf/taf-oim-2026-12-31.xsd#taf_documentDate" xlink:label="taf_documentDate" xlink:title="taf_documentDate Document Date"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_taf_originatingDocument" xlink:to="taf_documentDate" xlink:title="domain-member: p_taf_originatingDocument to taf_documentDate Document Date" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../taf/taf-oim-2026-12-31.xsd#taf_documentIdentifierType" xlink:label="taf_documentIdentifierType" xlink:title="taf_documentIdentifierType Document Identifier Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_taf_originatingDocument" xlink:to="taf_documentIdentifierType" xlink:title="domain-member: p_taf_originatingDocument to taf_documentIdentifierType Document Identifier Type" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../taf/taf-oim-2026-12-31.xsd#taf_documentIdentifierCode" xlink:label="taf_documentIdentifierCode" xlink:title="taf_documentIdentifierCode Document Identifier Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_taf_originatingDocument" xlink:to="taf_documentIdentifierCode" xlink:title="domain-member: p_taf_originatingDocument to taf_documentIdentifierCode Document Identifier Code" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../taf/taf-oim-2026-12-31.xsd#taf_documentIdentifierTaxCode" xlink:label="taf_documentIdentifierTaxCode" xlink:title="taf_documentIdentifierTaxCode Document Identifier Tax Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_taf_originatingDocument" xlink:to="taf_documentIdentifierTaxCode" xlink:title="domain-member: p_taf_originatingDocument to taf_documentIdentifierTaxCode Document Identifier Tax Code" order="10"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailParty">
    <!-- p_btx_detailParty all (has-hypercube) h_btx_detailParty link_btx_detailParty -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailParty" xlink:label="p_btx_detailParty" xlink:title="p_btx_detailParty"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_detailParty" xlink:label="h_btx_detailParty" xlink:title="h_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_detailParty" xlink:to="h_btx_detailParty" xlink:title="all (has-hypercube): p_btx_detailParty to h_btx_detailParty" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailParty" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_detailParty to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailParty" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_detailParty to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailParty" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_btx_detailParty to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailParty" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_btx_detailParty to d_btx_detailParty" order="4"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_detailPartyName" xlink:label="btx_detailPartyName" xlink:title="btx_detailPartyName Party Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_detailParty" xlink:to="btx_detailPartyName" xlink:title="domain-member: p_btx_detailParty to btx_detailPartyName Party Name" order="5"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_detailPartyId" xlink:label="btx_detailPartyId" xlink:title="btx_detailPartyId Party ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_detailParty" xlink:to="btx_detailPartyId" xlink:title="domain-member: p_btx_detailParty to btx_detailPartyId Party ID" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_detailPartyRole" xlink:label="btx_detailPartyRole" xlink:title="btx_detailPartyRole Party Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_detailParty" xlink:to="btx_detailPartyRole" xlink:title="domain-member: p_btx_detailParty to btx_detailPartyRole Party Role" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#btx_detailPartyBusinessDescription" xlink:label="btx_detailPartyBusinessDescription" xlink:title="btx_detailPartyBusinessDescription Party Business Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_detailParty" xlink:to="btx_detailPartyBusinessDescription" xlink:title="domain-member: p_btx_detailParty to btx_detailPartyBusinessDescription Party Business Description" order="8"/>
    <!-- p_btx_detailParty to targetRole link_bus_detailPartyPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyPhone" xlink:label="p_bus_detailPartyPhone" xlink:title="p_bus_detailPartyPhone Party_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyPhone" xlink:from="p_btx_detailParty" xlink:to="p_bus_detailPartyPhone" xlink:title="domain-member: p_btx_detailParty to p_bus_detailPartyPhone in link_bus_detailPartyPhone" order="9"/>
    <!-- p_btx_detailParty to targetRole link_bus_detailPartyFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyFax" xlink:label="p_bus_detailPartyFax" xlink:title="p_bus_detailPartyFax Party_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyFax" xlink:from="p_btx_detailParty" xlink:to="p_bus_detailPartyFax" xlink:title="domain-member: p_btx_detailParty to p_bus_detailPartyFax in link_bus_detailPartyFax" order="10"/>
    <!-- p_btx_detailParty to targetRole link_bus_detailPartyEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyEmail" xlink:label="p_bus_detailPartyEmail" xlink:title="p_bus_detailPartyEmail Party_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyEmail" xlink:from="p_btx_detailParty" xlink:to="p_bus_detailPartyEmail" xlink:title="domain-member: p_btx_detailParty to p_bus_detailPartyEmail in link_bus_detailPartyEmail" order="11"/>
    <!-- p_btx_detailParty to targetRole link_bus_detailPartyAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyAddress" xlink:label="p_bus_detailPartyAddress" xlink:title="p_bus_detailPartyAddress Party_ Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyAddress" xlink:from="p_btx_detailParty" xlink:to="p_bus_detailPartyAddress" xlink:title="domain-member: p_btx_detailParty to p_bus_detailPartyAddress in link_bus_detailPartyAddress" order="12"/>
    <!-- p_btx_detailParty to targetRole link_bus_detailPartyWebSite -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyWebSite" xlink:label="p_bus_detailPartyWebSite" xlink:title="p_bus_detailPartyWebSite Party_ Web Site"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyWebSite" xlink:from="p_btx_detailParty" xlink:to="p_bus_detailPartyWebSite" xlink:title="domain-member: p_btx_detailParty to p_bus_detailPartyWebSite in link_bus_detailPartyWebSite" order="13"/>
    <!-- p_btx_detailParty to targetRole link_bus_detailPartyContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContact" xlink:label="p_bus_detailPartyContact" xlink:title="p_bus_detailPartyContact Party_ Contact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContact" xlink:from="p_btx_detailParty" xlink:to="p_bus_detailPartyContact" xlink:title="domain-member: p_btx_detailParty to p_bus_detailPartyContact in link_bus_detailPartyContact" order="14"/>
    <!-- p_btx_detailParty to targetRole link_btx_detailPartyOrganizationIdentifier -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailPartyOrganizationIdentifier" xlink:label="p_btx_detailPartyOrganizationIdentifier" xlink:title="p_btx_detailPartyOrganizationIdentifier Organization Identifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailPartyOrganizationIdentifier" xlink:from="p_btx_detailParty" xlink:to="p_btx_detailPartyOrganizationIdentifier" xlink:title="domain-member: p_btx_detailParty to p_btx_detailPartyOrganizationIdentifier in link_btx_detailPartyOrganizationIdentifier" order="15"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyPhone">
    <!-- p_bus_detailPartyPhone all (has-hypercube) h_bus_detailPartyPhone link_bus_detailPartyPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyPhone" xlink:label="p_bus_detailPartyPhone" xlink:title="p_bus_detailPartyPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyPhone" xlink:label="h_bus_detailPartyPhone" xlink:title="h_bus_detailPartyPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyPhone" xlink:to="h_bus_detailPartyPhone" xlink:title="all (has-hypercube): p_bus_detailPartyPhone to h_bus_detailPartyPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyPhone" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyPhone to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyPhone" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyPhone to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyPhone" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyPhone to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyPhone" xlink:label="d_bus_detailPartyPhone" xlink:title="d_bus_detailPartyPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyPhone" xlink:to="d_bus_detailPartyPhone" xlink:title="hypercube-dimension: h_bus_detailPartyPhone to d_bus_detailPartyPhone" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyPhoneNumber" xlink:label="bus_detailPartyPhoneNumber" xlink:title="bus_detailPartyPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyPhone" xlink:to="bus_detailPartyPhoneNumber" xlink:title="domain-member: p_bus_detailPartyPhone to bus_detailPartyPhoneNumber Phone Number" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyPhoneNumberDescription" xlink:label="bus_detailPartyPhoneNumberDescription" xlink:title="bus_detailPartyPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyPhone" xlink:to="bus_detailPartyPhoneNumberDescription" xlink:title="domain-member: p_bus_detailPartyPhone to bus_detailPartyPhoneNumberDescription Phone Number Description" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyFax">
    <!-- p_bus_detailPartyFax all (has-hypercube) h_bus_detailPartyFax link_bus_detailPartyFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyFax" xlink:label="p_bus_detailPartyFax" xlink:title="p_bus_detailPartyFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyFax" xlink:label="h_bus_detailPartyFax" xlink:title="h_bus_detailPartyFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyFax" xlink:to="h_bus_detailPartyFax" xlink:title="all (has-hypercube): p_bus_detailPartyFax to h_bus_detailPartyFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyFax" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyFax to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyFax" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyFax to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyFax" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyFax to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyFax" xlink:label="d_bus_detailPartyFax" xlink:title="d_bus_detailPartyFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyFax" xlink:to="d_bus_detailPartyFax" xlink:title="hypercube-dimension: h_bus_detailPartyFax to d_bus_detailPartyFax" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyFaxNumber" xlink:label="bus_detailPartyFaxNumber" xlink:title="bus_detailPartyFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyFax" xlink:to="bus_detailPartyFaxNumber" xlink:title="domain-member: p_bus_detailPartyFax to bus_detailPartyFaxNumber Fax Number" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyFaxNumberUsage" xlink:label="bus_detailPartyFaxNumberUsage" xlink:title="bus_detailPartyFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyFax" xlink:to="bus_detailPartyFaxNumberUsage" xlink:title="domain-member: p_bus_detailPartyFax to bus_detailPartyFaxNumberUsage Fax Number Usage" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyEmail">
    <!-- p_bus_detailPartyEmail all (has-hypercube) h_bus_detailPartyEmail link_bus_detailPartyEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyEmail" xlink:label="p_bus_detailPartyEmail" xlink:title="p_bus_detailPartyEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyEmail" xlink:label="h_bus_detailPartyEmail" xlink:title="h_bus_detailPartyEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyEmail" xlink:to="h_bus_detailPartyEmail" xlink:title="all (has-hypercube): p_bus_detailPartyEmail to h_bus_detailPartyEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyEmail" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyEmail to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyEmail" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyEmail to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyEmail" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyEmail to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyEmail" xlink:label="d_bus_detailPartyEmail" xlink:title="d_bus_detailPartyEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyEmail" xlink:to="d_bus_detailPartyEmail" xlink:title="hypercube-dimension: h_bus_detailPartyEmail to d_bus_detailPartyEmail" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyEmailAddress" xlink:label="bus_detailPartyEmailAddress" xlink:title="bus_detailPartyEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyEmail" xlink:to="bus_detailPartyEmailAddress" xlink:title="domain-member: p_bus_detailPartyEmail to bus_detailPartyEmailAddress Email Address" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyEmailAddressUsage" xlink:label="bus_detailPartyEmailAddressUsage" xlink:title="bus_detailPartyEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyEmail" xlink:to="bus_detailPartyEmailAddressUsage" xlink:title="domain-member: p_bus_detailPartyEmail to bus_detailPartyEmailAddressUsage Email Address Usage" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyAddress">
    <!-- p_bus_detailPartyAddress all (has-hypercube) h_bus_detailPartyAddress link_bus_detailPartyAddress -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyAddress" xlink:label="p_bus_detailPartyAddress" xlink:title="p_bus_detailPartyAddress"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyAddress" xlink:label="h_bus_detailPartyAddress" xlink:title="h_bus_detailPartyAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyAddress" xlink:to="h_bus_detailPartyAddress" xlink:title="all (has-hypercube): p_bus_detailPartyAddress to h_bus_detailPartyAddress" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyAddress" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyAddress to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyAddress" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyAddress to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyAddress" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyAddress to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyAddress" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyAddress to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyAddress" xlink:label="d_bus_detailPartyAddress" xlink:title="d_bus_detailPartyAddress"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyAddress" xlink:to="d_bus_detailPartyAddress" xlink:title="hypercube-dimension: h_bus_detailPartyAddress to d_bus_detailPartyAddress" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressName" xlink:label="bus_detailPartyAddressName" xlink:title="bus_detailPartyAddressName Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressName" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressName Name" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressDescription" xlink:label="bus_detailPartyAddressDescription" xlink:title="bus_detailPartyAddressDescription Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressDescription" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressDescription Description" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressPurpose" xlink:label="bus_detailPartyAddressPurpose" xlink:title="bus_detailPartyAddressPurpose Purpose"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressPurpose" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressPurpose Purpose" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressLocationId" xlink:label="bus_detailPartyAddressLocationId" xlink:title="bus_detailPartyAddressLocationId Location ID"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressLocationId" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressLocationId Location ID" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressBuildingNumber" xlink:label="bus_detailPartyAddressBuildingNumber" xlink:title="bus_detailPartyAddressBuildingNumber Building Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressBuildingNumber" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressBuildingNumber Building Number" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressStreet" xlink:label="bus_detailPartyAddressStreet" xlink:title="bus_detailPartyAddressStreet Street"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressStreet" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressStreet Street" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressDetail" xlink:label="bus_detailPartyAddressDetail" xlink:title="bus_detailPartyAddressDetail Address Detail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressDetail" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressDetail Address Detail" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressCity" xlink:label="bus_detailPartyAddressCity" xlink:title="bus_detailPartyAddressCity City"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressCity" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressCity City" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressStateOrProvince" xlink:label="bus_detailPartyAddressStateOrProvince" xlink:title="bus_detailPartyAddressStateOrProvince State or Province"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressStateOrProvince" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressStateOrProvince State or Province" order="14"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressCountry" xlink:label="bus_detailPartyAddressCountry" xlink:title="bus_detailPartyAddressCountry Country"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressCountry" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressCountry Country" order="15"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressZipOrPostalCode" xlink:label="bus_detailPartyAddressZipOrPostalCode" xlink:title="bus_detailPartyAddressZipOrPostalCode Zip or Postal Code"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressZipOrPostalCode" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressZipOrPostalCode Zip or Postal Code" order="16"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyAddressActiveIndicator" xlink:label="bus_detailPartyAddressActiveIndicator" xlink:title="bus_detailPartyAddressActiveIndicator Active Indicator"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyAddress" xlink:to="bus_detailPartyAddressActiveIndicator" xlink:title="domain-member: p_bus_detailPartyAddress to bus_detailPartyAddressActiveIndicator Active Indicator" order="17"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyWebSite">
    <!-- p_bus_detailPartyWebSite all (has-hypercube) h_bus_detailPartyWebSite link_bus_detailPartyWebSite -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyWebSite" xlink:label="p_bus_detailPartyWebSite" xlink:title="p_bus_detailPartyWebSite"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyWebSite" xlink:label="h_bus_detailPartyWebSite" xlink:title="h_bus_detailPartyWebSite"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyWebSite" xlink:to="h_bus_detailPartyWebSite" xlink:title="all (has-hypercube): p_bus_detailPartyWebSite to h_bus_detailPartyWebSite" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyWebSite" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyWebSite to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyWebSite" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyWebSite to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyWebSite" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyWebSite to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyWebSite" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyWebSite to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyWebSite" xlink:label="d_bus_detailPartyWebSite" xlink:title="d_bus_detailPartyWebSite"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyWebSite" xlink:to="d_bus_detailPartyWebSite" xlink:title="hypercube-dimension: h_bus_detailPartyWebSite to d_bus_detailPartyWebSite" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyWebSiteUrl" xlink:label="bus_detailPartyWebSiteUrl" xlink:title="bus_detailPartyWebSiteUrl Web Site URL"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyWebSite" xlink:to="bus_detailPartyWebSiteUrl" xlink:title="domain-member: p_bus_detailPartyWebSite to bus_detailPartyWebSiteUrl Web Site URL" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyWebSiteDescription" xlink:label="bus_detailPartyWebSiteDescription" xlink:title="bus_detailPartyWebSiteDescription Web Site Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyWebSite" xlink:to="bus_detailPartyWebSiteDescription" xlink:title="domain-member: p_bus_detailPartyWebSite to bus_detailPartyWebSiteDescription Web Site Description" order="7"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContact">
    <!-- p_bus_detailPartyContact all (has-hypercube) h_bus_detailPartyContact link_bus_detailPartyContact -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContact" xlink:label="p_bus_detailPartyContact" xlink:title="p_bus_detailPartyContact"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyContact" xlink:label="h_bus_detailPartyContact" xlink:title="h_bus_detailPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyContact" xlink:to="h_bus_detailPartyContact" xlink:title="all (has-hypercube): p_bus_detailPartyContact to h_bus_detailPartyContact" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContact" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyContact to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContact" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyContact to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContact" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyContact to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContact" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyContact to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContact" xlink:label="d_bus_detailPartyContact" xlink:title="d_bus_detailPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContact" xlink:to="d_bus_detailPartyContact" xlink:title="hypercube-dimension: h_bus_detailPartyContact to d_bus_detailPartyContact" order="5"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactPrefix" xlink:label="bus_detailPartyContactPrefix" xlink:title="bus_detailPartyContactPrefix Contact Prefix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactPrefix" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactPrefix Contact Prefix" order="6"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactLastName" xlink:label="bus_detailPartyContactLastName" xlink:title="bus_detailPartyContactLastName Contact Last Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactLastName" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactLastName Contact Last Name" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactFirstName" xlink:label="bus_detailPartyContactFirstName" xlink:title="bus_detailPartyContactFirstName Contact First Name"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactFirstName" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactFirstName Contact First Name" order="8"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactSuffix" xlink:label="bus_detailPartyContactSuffix" xlink:title="bus_detailPartyContactSuffix Contact Suffix"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactSuffix" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactSuffix Contact Suffix" order="9"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactAttentionLine" xlink:label="bus_detailPartyContactAttentionLine" xlink:title="bus_detailPartyContactAttentionLine Contact Attention Line"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactAttentionLine" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactAttentionLine Contact Attention Line" order="10"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactPositionRole" xlink:label="bus_detailPartyContactPositionRole" xlink:title="bus_detailPartyContactPositionRole Contact Position Role"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactPositionRole" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactPositionRole Contact Position Role" order="11"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactContactType" xlink:label="bus_detailPartyContactContactType" xlink:title="bus_detailPartyContactContactType Contact Contact Type"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactContactType" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactContactType Contact Contact Type" order="12"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactLocationIdCrossReference" xlink:label="bus_detailPartyContactLocationIdCrossReference" xlink:title="bus_detailPartyContactLocationIdCrossReference Contact Location ID cross reference"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactLocationIdCrossReference" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactLocationIdCrossReference Contact Location ID cross reference" order="13"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactActive" xlink:label="bus_detailPartyContactActive" xlink:title="bus_detailPartyContactActive Contact Active"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContact" xlink:to="bus_detailPartyContactActive" xlink:title="domain-member: p_bus_detailPartyContact to bus_detailPartyContactActive Contact Active" order="14"/>
    <!-- p_bus_detailPartyContact to targetRole link_bus_detailPartyContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContactPhone" xlink:label="p_bus_detailPartyContactPhone" xlink:title="p_bus_detailPartyContactPhone Contact_ Phone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactPhone" xlink:from="p_bus_detailPartyContact" xlink:to="p_bus_detailPartyContactPhone" xlink:title="domain-member: p_bus_detailPartyContact to p_bus_detailPartyContactPhone in link_bus_detailPartyContactPhone" order="15"/>
    <!-- p_bus_detailPartyContact to targetRole link_bus_detailPartyContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContactFax" xlink:label="p_bus_detailPartyContactFax" xlink:title="p_bus_detailPartyContactFax Contact_ Fax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactFax" xlink:from="p_bus_detailPartyContact" xlink:to="p_bus_detailPartyContactFax" xlink:title="domain-member: p_bus_detailPartyContact to p_bus_detailPartyContactFax in link_bus_detailPartyContactFax" order="16"/>
    <!-- p_bus_detailPartyContact to targetRole link_bus_detailPartyContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContactEmail" xlink:label="p_bus_detailPartyContactEmail" xlink:title="p_bus_detailPartyContactEmail Contact_ Email"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xbrldt:targetRole="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactEmail" xlink:from="p_bus_detailPartyContact" xlink:to="p_bus_detailPartyContactEmail" xlink:title="domain-member: p_bus_detailPartyContact to p_bus_detailPartyContactEmail in link_bus_detailPartyContactEmail" order="17"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactPhone">
    <!-- p_bus_detailPartyContactPhone all (has-hypercube) h_bus_detailPartyContactPhone link_bus_detailPartyContactPhone -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContactPhone" xlink:label="p_bus_detailPartyContactPhone" xlink:title="p_bus_detailPartyContactPhone"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyContactPhone" xlink:label="h_bus_detailPartyContactPhone" xlink:title="h_bus_detailPartyContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyContactPhone" xlink:to="h_bus_detailPartyContactPhone" xlink:title="all (has-hypercube): p_bus_detailPartyContactPhone to h_bus_detailPartyContactPhone" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactPhone" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyContactPhone to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactPhone" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyContactPhone to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactPhone" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyContactPhone to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactPhone" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyContactPhone to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContact" xlink:label="d_bus_detailPartyContact" xlink:title="d_bus_detailPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactPhone" xlink:to="d_bus_detailPartyContact" xlink:title="hypercube-dimension: h_bus_detailPartyContactPhone to d_bus_detailPartyContact" order="5"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContactPhone" xlink:label="d_bus_detailPartyContactPhone" xlink:title="d_bus_detailPartyContactPhone"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactPhone" xlink:to="d_bus_detailPartyContactPhone" xlink:title="hypercube-dimension: h_bus_detailPartyContactPhone to d_bus_detailPartyContactPhone" order="6"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactPhoneNumber" xlink:label="bus_detailPartyContactPhoneNumber" xlink:title="bus_detailPartyContactPhoneNumber Phone Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContactPhone" xlink:to="bus_detailPartyContactPhoneNumber" xlink:title="domain-member: p_bus_detailPartyContactPhone to bus_detailPartyContactPhoneNumber Phone Number" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactPhoneNumberDescription" xlink:label="bus_detailPartyContactPhoneNumberDescription" xlink:title="bus_detailPartyContactPhoneNumberDescription Phone Number Description"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContactPhone" xlink:to="bus_detailPartyContactPhoneNumberDescription" xlink:title="domain-member: p_bus_detailPartyContactPhone to bus_detailPartyContactPhoneNumberDescription Phone Number Description" order="8"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactFax">
    <!-- p_bus_detailPartyContactFax all (has-hypercube) h_bus_detailPartyContactFax link_bus_detailPartyContactFax -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContactFax" xlink:label="p_bus_detailPartyContactFax" xlink:title="p_bus_detailPartyContactFax"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyContactFax" xlink:label="h_bus_detailPartyContactFax" xlink:title="h_bus_detailPartyContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyContactFax" xlink:to="h_bus_detailPartyContactFax" xlink:title="all (has-hypercube): p_bus_detailPartyContactFax to h_bus_detailPartyContactFax" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactFax" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyContactFax to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactFax" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyContactFax to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactFax" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyContactFax to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactFax" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyContactFax to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContact" xlink:label="d_bus_detailPartyContact" xlink:title="d_bus_detailPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactFax" xlink:to="d_bus_detailPartyContact" xlink:title="hypercube-dimension: h_bus_detailPartyContactFax to d_bus_detailPartyContact" order="5"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContactFax" xlink:label="d_bus_detailPartyContactFax" xlink:title="d_bus_detailPartyContactFax"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactFax" xlink:to="d_bus_detailPartyContactFax" xlink:title="hypercube-dimension: h_bus_detailPartyContactFax to d_bus_detailPartyContactFax" order="6"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactFaxNumber" xlink:label="bus_detailPartyContactFaxNumber" xlink:title="bus_detailPartyContactFaxNumber Fax Number"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContactFax" xlink:to="bus_detailPartyContactFaxNumber" xlink:title="domain-member: p_bus_detailPartyContactFax to bus_detailPartyContactFaxNumber Fax Number" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactFaxNumberUsage" xlink:label="bus_detailPartyContactFaxNumberUsage" xlink:title="bus_detailPartyContactFaxNumberUsage Fax Number Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContactFax" xlink:to="bus_detailPartyContactFaxNumberUsage" xlink:title="domain-member: p_bus_detailPartyContactFax to bus_detailPartyContactFaxNumberUsage Fax Number Usage" order="8"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_bus_detailPartyContactEmail">
    <!-- p_bus_detailPartyContactEmail all (has-hypercube) h_bus_detailPartyContactEmail link_bus_detailPartyContactEmail -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#p_bus_detailPartyContactEmail" xlink:label="p_bus_detailPartyContactEmail" xlink:title="p_bus_detailPartyContactEmail"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_bus_detailPartyContactEmail" xlink:label="h_bus_detailPartyContactEmail" xlink:title="h_bus_detailPartyContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_bus_detailPartyContactEmail" xlink:to="h_bus_detailPartyContactEmail" xlink:title="all (has-hypercube): p_bus_detailPartyContactEmail to h_bus_detailPartyContactEmail" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactEmail" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_bus_detailPartyContactEmail to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactEmail" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_bus_detailPartyContactEmail to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactEmail" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_bus_detailPartyContactEmail to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactEmail" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_bus_detailPartyContactEmail to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContact" xlink:label="d_bus_detailPartyContact" xlink:title="d_bus_detailPartyContact"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactEmail" xlink:to="d_bus_detailPartyContact" xlink:title="hypercube-dimension: h_bus_detailPartyContactEmail to d_bus_detailPartyContact" order="5"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_bus_detailPartyContactEmail" xlink:label="d_bus_detailPartyContactEmail" xlink:title="d_bus_detailPartyContactEmail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_bus_detailPartyContactEmail" xlink:to="d_bus_detailPartyContactEmail" xlink:title="hypercube-dimension: h_bus_detailPartyContactEmail to d_bus_detailPartyContactEmail" order="6"/>
    <!-- domain-member -->
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactEmailAddress" xlink:label="bus_detailPartyContactEmailAddress" xlink:title="bus_detailPartyContactEmailAddress Email Address"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContactEmail" xlink:to="bus_detailPartyContactEmailAddress" xlink:title="domain-member: p_bus_detailPartyContactEmail to bus_detailPartyContactEmailAddress Email Address" order="7"/>
    <link:loc xlink:type="locator" xlink:href="../../bus/bus-oim-2026-12-31.xsd#bus_detailPartyContactEmailAddressUsage" xlink:label="bus_detailPartyContactEmailAddressUsage" xlink:title="bus_detailPartyContactEmailAddressUsage Email Address Usage"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_bus_detailPartyContactEmail" xlink:to="bus_detailPartyContactEmailAddressUsage" xlink:title="domain-member: p_bus_detailPartyContactEmail to bus_detailPartyContactEmailAddressUsage Email Address Usage" order="8"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="https://www.xbrl.or.jp/taxonomy/xbrl-gl-next/role/link_btx_detailPartyOrganizationIdentifier">
    <!-- p_btx_detailPartyOrganizationIdentifier all (has-hypercube) h_btx_detailPartyOrganizationIdentifier link_btx_detailPartyOrganizationIdentifier -->
    <link:loc xlink:type="locator" xlink:href="../../btx/btx-oim-2026-12-31.xsd#p_btx_detailPartyOrganizationIdentifier" xlink:label="p_btx_detailPartyOrganizationIdentifier" xlink:title="p_btx_detailPartyOrganizationIdentifier"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#h_btx_detailPartyOrganizationIdentifier" xlink:label="h_btx_detailPartyOrganizationIdentifier" xlink:title="h_btx_detailPartyOrganizationIdentifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="p_btx_detailPartyOrganizationIdentifier" xlink:to="h_btx_detailPartyOrganizationIdentifier" xlink:title="all (has-hypercube): p_btx_detailPartyOrganizationIdentifier to h_btx_detailPartyOrganizationIdentifier" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <!-- hypercube-dimension -->
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_businessTransactions" xlink:label="d_btx_businessTransactions" xlink:title="d_btx_businessTransactions"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailPartyOrganizationIdentifier" xlink:to="d_btx_businessTransactions" xlink:title="hypercube-dimension: h_btx_detailPartyOrganizationIdentifier to d_btx_businessTransactions" order="1"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionHeader" xlink:label="d_btx_transactionHeader" xlink:title="d_btx_transactionHeader"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailPartyOrganizationIdentifier" xlink:to="d_btx_transactionHeader" xlink:title="hypercube-dimension: h_btx_detailPartyOrganizationIdentifier to d_btx_transactionHeader" order="2"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_transactionDetail" xlink:label="d_btx_transactionDetail" xlink:title="d_btx_transactionDetail"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailPartyOrganizationIdentifier" xlink:to="d_btx_transactionDetail" xlink:title="hypercube-dimension: h_btx_detailPartyOrganizationIdentifier to d_btx_transactionDetail" order="3"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailParty" xlink:label="d_btx_detailParty" xlink:title="d_btx_detailParty"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailPartyOrganizationIdentifier" xlink:to="d_btx_detailParty" xlink:title="hypercube-dimension: h_btx_detailPartyOrganizationIdentifier to d_btx_detailParty" order="4"/>
    <link:loc xlink:type="locator" xlink:href="btx-all-oim-2026-12-31.xsd#d_btx_detailPartyOrganizationIdentifier" xlink:label="d_btx_detailPartyOrganizationIdentifier" xlink:title="d_btx_detailPartyOrganizationIdentifier"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="h_btx_detailPartyOrganizationIdentifier" xlink:to="d_btx_detailPartyOrganizationIdentifier" xlink:title="hypercube-dimension: h_btx_detailPartyOrganizationIdentifier to d_btx_detailPartyOrganizationIdentifier" order="5"/>
    <!-- domain-member -->
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    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="p_btx_detailPartyOrganizationIdentifier" xlink:to="btx_detailPartyOrganizationIdentifierCode" xlink:title="domain-member: p_btx_detailPartyOrganizationIdentifier to btx_detailPartyOrganizationIdentifierCode Organization Identifier Code" order="6"/>
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