foreign service instituteglossary / FOREIGN SERVICE INSTITUTE Foreign Service Institute. A unit in the U.S. Department of State responsible for training officers and employees of the Foreign Service as well as personnel in other agencies. — Abbr. FSI. 词条贡献者 译员Jerry,知名法学院知识产权法,专注翻译各种与版权与商标诉讼有关的法律文件。