/ ɪˈrevəkəbl; NAmE / adjective
( formal ) that cannot be changed
SYN final :
an irrevocable decision / step
► ir·rev·oc·ably / -əbli; NAmE / adverb :
irrevocably committed
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WORD ORIGIN
late Middle English : from Old French , or from Latin irrevocabilis , from in- not + revocabilis able to be revoked (from the verb revocare ).