irreversible

The definition of irreversible is something that cannot be altered, changed or undone.

(adjective)

Having your tonsils permanently removed is an example of an irreversible operation.

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See irreversible in Webster's New World College Dictionary

adjective

not reversible; specif.,
  1. that cannot be repealed or annulled
  2. that cannot be turned inside out, run backward, etc.

Related Forms:

See irreversible in American Heritage Dictionary 4

adjective
Impossible to reverse: an irreversible momentum toward open revolution.

Related Forms:

  • irˌre·versˌi·bilˈi·ty, irˌre·versˈi·ble·ness noun
  • irˌre·versˈi·bly adverb

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