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 资深译员Walker,毕业于亚洲一流的高级翻译学院,擅长翻译各类与尽职调查相关的法律文件。