A counterpart or equivalent thing; something that corresponds to or balances another thing in a pair or agreement.
From French contre- (counter) + partie (part), ultimately from Latin partiri (to divide/share). The term describes two things that stand opposite each other as equals in a transaction or relationship.
This accounting term was essential in international trade—merchants needed to track contreparties (the other side of every deal) to make sure both parties benefited equally from their exchanges.
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