PLENIPOTENTIARY, adj. Having full power. A Minister Plenipotentiary is a diplomatist possessing absolute authority on condition that he never exert it.
Source: The Devil's Dictionary, 1911.
-- Ambrose Bierce, (Jun 24 1842-1914), US journalist, short-story writer; He was a noted wit, satirist and sardonic short story writer who disappeared while covering the Mexican revolution.