IPA: /ˌɪn.təˈpɑːr.ti/
KK: /ɪntərˈpɑrti/
Relating to or occurring between different political parties.
The interparty agreement was crucial for passing the new legislation.
Interparty → It is formed from "inter-" (meaning between) and "party" (from Old French *partie*, meaning a part or division). The word refers to something that occurs between different parties or groups.
Think of things happening 'between' ('inter-') different 'parts' ('party') — that's why interparty refers to interactions between different groups.