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 译员Clara,毕业于国内知名法学院,擅长翻译有关建筑领域的法律文件。