copartyglossary / COPARTY coparty. A litigant or participant in a legal transaction who has a like status with another party; a party on the same side of a lawsuit. — Also termed joint party. See CODEFENDANT; COPLAINTIFF. 词条贡献者 法律翻译舒婷,知名法学院保险学专业,专注翻译各类与保险与再保险诉讼有关的法律文件。