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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a155eb-eca0-703e-94ef-384d9e4c4165,g:755c882a-4a61-4ae2-bcf5-6ec231b0860e-->
<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-20261019.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_01a155eb-eca0-7700-a573-2918286f7f77" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_01a155eb-eca0-7885-b3aa-d4d324e52df1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_DocumentInformationTable_01a155eb-eca0-7885-b3aa-d4d324e52df1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationDocumentAxis_01a155eb-eca0-7d61-bb9e-622748c91621" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationDocumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_01a155eb-eca0-7885-b3aa-d4d324e52df1" xlink:to="loc_dei_DocumentInformationDocumentAxis_01a155eb-eca0-7d61-bb9e-622748c91621" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_01a155eb-eca0-7d61-bb9e-622748c91621_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_DocumentInformationDocumentAxis_01a155eb-eca0-7d61-bb9e-622748c91621" xlink:to="loc_dei_DocumentDomain_01a155eb-eca0-7d61-bb9e-622748c91621_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_01a155eb-eca0-7c15-843e-d1e439863b89" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_DocumentInformationDocumentAxis_01a155eb-eca0-7d61-bb9e-622748c91621" xlink:to="loc_dei_DocumentDomain_01a155eb-eca0-7c15-843e-d1e439863b89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a155eb-eca0-79da-8d5a-543f8e716f59" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_DocumentType_01a155eb-eca0-79da-8d5a-543f8e716f59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a155eb-eca0-77ef-9ae4-7b857c6437e6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_EntityRegistrantName_01a155eb-eca0-77ef-9ae4-7b857c6437e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a155eb-eca0-7a35-b898-2b699bd9ba4f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_EntityFileNumber_01a155eb-eca0-7a35-b898-2b699bd9ba4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a155eb-eca0-72fe-b6ed-3b6736773763" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_EntityAddressAddressLine1_01a155eb-eca0-72fe-b6ed-3b6736773763" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a155eb-eca0-7388-807e-7fe747d7d372" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_EntityAddressCityOrTown_01a155eb-eca0-7388-807e-7fe747d7d372" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CountryOfIncorporation_01a155eb-eca0-7328-aa5a-4bbc205bc61c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CountryOfIncorporation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_ifrs-full_CountryOfIncorporation_01a155eb-eca0-7328-aa5a-4bbc205bc61c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a155eb-eca0-7195-b372-162bc71c7368" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_EntityAddressPostalZipCode_01a155eb-eca0-7195-b372-162bc71c7368" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a155eb-eca0-76d9-9355-f2342adfa12f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_LocalPhoneNumber_01a155eb-eca0-76d9-9355-f2342adfa12f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_01a155eb-eca0-7f6f-bf97-396d203b07fa" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_DocumentAnnualReport_01a155eb-eca0-7f6f-bf97-396d203b07fa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a155eb-eca0-7feb-89ab-59297c01ac2e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_EntityCentralIndexKey_01a155eb-eca0-7feb-89ab-59297c01ac2e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a155eb-eca0-7180-8f87-1a3f66ac7b45" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_DocumentPeriodEndDate_01a155eb-eca0-7180-8f87-1a3f66ac7b45" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_01a155eb-eca0-7602-9619-79a32e7d4f7d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_CurrentFiscalYearEndDate_01a155eb-eca0-7602-9619-79a32e7d4f7d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a155eb-eca0-7978-90a2-11b1f88f66bd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_AmendmentFlag_01a155eb-eca0-7978-90a2-11b1f88f66bd" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a155eb-eca0-75c4-9dce-af6516a48545" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a155eb-eca0-7700-a573-2918286f7f77" xlink:to="loc_dei_CityAreaCode_01a155eb-eca0-75c4-9dce-af6516a48545" xlink:type="arc" order="13"/>
  </link:definitionLink>
</link:linkbase>
