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not to be revoked or recalled; unable to be repealed or annulled; unalterable: an irrevocable decree.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).

irrevocably
c.1600, from irrevocable (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They represent a gender revolution that many see as irrevocably tied to a
  reproductive revolution.
Surplus weapon-grade fissile materials can be profitably and irrevocably
  demilitarized by burnup in existing nuclear reactors.
There is obviously disagreement among neuro-scientists on the theory that you
  claim was irrevocably disproved many years ago.
But whatever you call him, his vision has changed the world irrevocably.
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