Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Impossible to reverse: an irreversible momentum toward open revolution.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Incapable of being reversed or turned about or back; incapable of being made to run backward.
  • adj. Incapable of being reversed, recalled, repealed, or annulled.
  • adj. Incapable of being reversed to the original state without consumption of free energy and increase of entropy.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Incapable of being reversed or turned about or back; incapable of being made to run backward.
  • adj. Incapable of being reversed, recalled, repealed, or annulled.

from The Century Dictionary and Cyclopedia

  • Not reversible; incapable of being reversed or inverted.
  • Not to be recalled or annulled.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. incapable of being reversed

Etymologies

ir- +‎ reversible (Wiktionary)

Examples

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