In legal contexts, one of two or more parties in a joint action, agreement, or lawsuit.
From co- + party (from Old French partie, a division or side, from Latin partita). Legal terminology uses coparty to clarify when multiple parties have equal standing.
Coparty is legal jargon that survives in court documents and contracts, but it's slowly being replaced by 'co-defendant' or 'co-plaintiff'—words that are more specific about what role each coparty plays.
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