third party defendantglossary / THIRD-PARTY DEFENDANT third-party defendant. A party brought into a lawsuit by the original defendant. [Cases: Federal Civil Procedure 281; Parties 49. C.J.S. Parties § 127.] 词条贡献者 双语律师Howard,毕业于法国一流的高级翻译学院,擅长翻译各类与欧美消费者隐私法规相关的法律文件。