PLE'NARY, adjective [Latin plenus.] Full; entire; complete; as a plenary license; plenary consent; plenary indulgence. The plenary indulgence of the pope is an entire remission of penalties to all sins. PLE'NARY, noun Decisive procedure. [Not used.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI