IPA: //ˈkaʊntərˌpɑːrti//
KK: /ˈkaʊntərˌpɑrti/
The other person or group involved in a financial deal or agreement.
In a loan agreement, the bank is the lender and the borrower is the counterparty.
Counterparty → It is formed from "counter-" (meaning opposite or against, derived from Latin *contra*) and "party" (from Old French *partie*, meaning a part or side). The word refers to a party that is on the opposite side of a transaction or agreement.
Think of 'counter-' meaning opposite and 'party' as a side in a deal — a counterparty is simply the opposite side in a transaction.