Definition of irrevocable adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪˈrevəkəbl//
; NAmE NAmE//ɪˈrevəkəbl//
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that cannot be changed synonym final an irrevocable decision/step Word Origin late Middle English: from Old French, or from Latin irrevocabilis, from in- ‘not’ + revocabilis ‘able to be revoked’ (from the verb revocare).
See the Oxford Advanced American Dictionary entry: irrevocable