Irrevocable
Pronunciation : Ir*rev"o*ca*ble
Part of Speech : a.
Etymology : [L. irrevocabilis: cf. F. irr?vocable. See In- not, and Revoke, and cf. Irrevocable.]
Definition : Defn: Incapable of being recalled or revoked; unchangeable; irreversible; unalterable; as, an irrevocable promise or decree; irrevocable fate. Firm and irrevocable is my doom. Shak. -- Ir*rev"o*ca*ble*ness, n. -- Ir*rev"o*ca*bly, adv.
Source : Webster's Unabridged Dictionary, 1913