irrevocable

[ih-rev-uh-kuh-buhl]
adjective
not to be revoked or recalled; unable to be repealed or annulled; unalterable: an irrevocable decree.

Origin:
1350–1400; Middle English < Latin irrevocābilis. See ir-2, revocable

irrevocability, irrevocableness, noun
irrevocably, adverb
nonirrevocability, noun
nonirrevocable, adjective
nonirrevocableness, noun
nonirrevocably, adverb
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World English Dictionary
irrevocable (ɪˈrɛvəkəbəl)
 
adj
not able to be revoked, changed, or undone; unalterable
 
irrevoca'bility
 
n
 
ir'revocableness
 
n
 
ir'revocably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

irrevocable
late 14c., from L. irrevocabilis "that cannot be recalled," from in- "not" + revocabilis (see revoke).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As soon as something becomes a video game, apparently it's effect on society is
  irrevocable.
If the chairman or dean made a prompt, irrevocable decision, things would go a
  lot quicker.
The fathers themselves would have been the first to declare that their
  prerogatives were not irrevocable.
If only she had done something irrevocable, something he couldn't forget,
  something so bad she couldn't take it back.
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