'Irrevokable' definitions:

Definition of 'irrevokable'

adjective

Incapable of being retracted or revoked; "firm and irrevocable is my doom"- Shakespeare [syn: irrevocable, irrevokable] [ant: revocable, revokable]

From: GCIDE

Irrevokable \Ir`re*vok"a*ble\, a. [Pref. ir- not + revoke.] Irrevocable. [R.] [1913 Webster]