1. (n.) A person invested with full power to transact any business\; especially, an ambassador or envoy to a foreign court, with full power to negotiate a treaty, or to transact other business.

2. (a.) Containing or conferring full power; invested with full power; as, plenipotentiary license; plenipotentiary ministers.

absolute all-powerful almighty ambassador ambassadorial ambassadress apostolic delegate attache career diplomat chancellor charge commercial attache consul consul general consular consular agent diplomat diplomatic diplomatic agent diplomatist emissary envoy envoy extraordinary foreign service officer internuncio legate military attache minister minister plenipotentiary minister resident ministerial nuncio omnipotent resident secretary of legation sovereign supreme unlimited vice-consul vice-legate