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 资深译员姚坚,毕业于一所培养高级翻译以及跨文化事务专家的精英大学,专注翻译各种与私募资本有关的法律文件。