plenipotentiary

Invested with or conferring full powers.

A diplomatic agent, such as an ambassador, fully authorized to represent his or her government.

Invested with, having, or bestowing full power.

(-riz.). A person invested with full power to transact any business; specifically, an ambassador or envoy to a foreign court, furnished with full powers to negotiate a treaty or to transact other business.

Synonyms See ambassador, 1.