Webster's Revised Unabridged Dictionary · 1913

Plenary

Plenary , adjective

[Late Latin plenarius, from Latin plenus full. See Plenty.]

Full; entire; complete; absolute; as, a plenary license; plenary authority.
A treatise on a subject should be plenary or full. — I. Watts
Collocations (2)
Plenary indulgence (Roman Catholic Church) , an entire remission of temporal punishment due to, or canonical penance for, all sins.
Plenary inspiration (Theology) , See under Inspiration.

Plenary , noun

(Law) Decisive procedure. [Obsolete]