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 资深译员文楷,毕业于亚洲一流的高级翻译学院,擅长翻译各类与电信、媒体和技术相关的法律文件。