a. [ L. irrevocabilis: cf. F. irrévocable. See In- not, and Revoke, and cf. Irrevocable. ] Incapable of being recalled or revoked; unchangeable; irreversible; unalterable; as, an irrevocable promise or decree; irrevocable fate. [ 1913 Webster ]
Firm and irrevocable is my doom. Shak.
-- Ir*rev"o*ca*ble*ness, n. -- Ir*rev"o*ca*bly, adv. [ 1913 Webster ]