Etymology
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irrevocable (adj.)

also irrevokable, late 14c., from Latin irrevocabilis "that cannot be recalled, unalterable," from assimilated form of in- "not, opposite of" (see in- (1)) + revocabilis (see revoke). Related: Irrevocably.

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Definitions of irrevocable

irrevocable (adj.)
incapable of being retracted or revoked; "firm and irrevocable is my doom"- Shakespeare;
Synonyms: irrevokable
From wordnet.princeton.edu