What does "plenipotentiary" mean?

Plenipotentiary: 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.

Additional senses

  1. 2.Containing or conferring full power; invested with full power; as, plenipotentiary license; plenipotentiary ministers. Howell.

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