PLENIPOTEN'TIARY,noun A person invested with full power to transact any business; usually, an embassador or envoy to a foreign court, furnished with full power to negotiate a treaty or to transact other business. PLENIPOTEN'TIARY, adjective Containing full power; as plenipotentiary license or authority.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI