meaning of plenipotentiary
1. 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. Containing or conferring full power; invested with full power; as, plenipotentiary license; plenipotentiary ministers.
3. a diplomat who is fully authorized to represent his or her government