<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019f71c2-f106-7091-b420-0a686e5343d7,g:2b08ed8a-e05c-47e5-a92f-cafcc355ddff-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <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/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-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <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: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:roleRef roleURI="http://www.interplatforminc.com/role/Cover" xlink:type="simple" xlink:href="intr-20260717.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.interplatforminc.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019f71c2-f106-7a2b-863c-55c24fdf0726" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_DocumentInformationTable_019f71c2-f106-7a2b-863c-55c24fdf0726" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationDocumentAxis_019f71c2-f106-7acb-bead-fbc88760a241" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentInformationDocumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019f71c2-f106-7a2b-863c-55c24fdf0726" xlink:to="loc_dei_DocumentInformationDocumentAxis_019f71c2-f106-7acb-bead-fbc88760a241" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_019f71c2-f106-7acb-bead-fbc88760a241_default" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_DocumentInformationDocumentAxis_019f71c2-f106-7acb-bead-fbc88760a241" xlink:to="loc_dei_DocumentDomain_019f71c2-f106-7acb-bead-fbc88760a241_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_019f71c2-f106-76ba-b912-c5baf4e73c18" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_DocumentInformationDocumentAxis_019f71c2-f106-7acb-bead-fbc88760a241" xlink:to="loc_dei_DocumentDomain_019f71c2-f106-76ba-b912-c5baf4e73c18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019f71c2-f106-7ca3-a005-255e664f1600" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_DocumentType_019f71c2-f106-7ca3-a005-255e664f1600" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019f71c2-f106-7e2b-9794-bbd9abf4894f" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_EntityRegistrantName_019f71c2-f106-7e2b-9794-bbd9abf4894f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019f71c2-f106-76ff-bcca-4370450b088e" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_EntityFileNumber_019f71c2-f106-76ff-bcca-4370450b088e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019f71c2-f106-7ebc-be85-583d6d6c3b2f" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_EntityAddressAddressLine1_019f71c2-f106-7ebc-be85-583d6d6c3b2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019f71c2-f106-7e3c-8cf0-35264abc500c" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_EntityAddressCityOrTown_019f71c2-f106-7e3c-8cf0-35264abc500c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CountryOfIncorporation_019f71c2-f106-7220-be0d-ffd21fdd1959" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CountryOfIncorporation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_ifrs-full_CountryOfIncorporation_019f71c2-f106-7220-be0d-ffd21fdd1959" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019f71c2-f106-7d74-b2f3-08e8fa405a31" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_EntityAddressPostalZipCode_019f71c2-f106-7d74-b2f3-08e8fa405a31" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019f71c2-f106-7978-9ad2-abf66f32da97" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_LocalPhoneNumber_019f71c2-f106-7978-9ad2-abf66f32da97" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_019f71c2-f106-78e5-ae0b-c5775e08a779" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_DocumentAnnualReport_019f71c2-f106-78e5-ae0b-c5775e08a779" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019f71c2-f106-772d-a44d-2d2b703e6091" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_EntityCentralIndexKey_019f71c2-f106-772d-a44d-2d2b703e6091" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019f71c2-f106-7f2a-aeda-0bd047b6af8a" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_DocumentPeriodEndDate_019f71c2-f106-7f2a-aeda-0bd047b6af8a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019f71c2-f106-782b-b357-60f5df70a26b" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_CurrentFiscalYearEndDate_019f71c2-f106-782b-b357-60f5df70a26b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019f71c2-f106-70c2-ad2d-52c0d7eb64f7" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_AmendmentFlag_019f71c2-f106-70c2-ad2d-52c0d7eb64f7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019f71c2-f106-78c6-86e6-e949321efe38" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019f71c2-f106-7848-a5e6-aa89e473d14d" xlink:to="loc_dei_CityAreaCode_019f71c2-f106-78c6-86e6-e949321efe38" xlink:type="arc" order="13"/>
  </link:definitionLink>
</link:linkbase>
