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

  • n. The act of extinguishing.
  • n. The condition of being extinguished.
  • n. The fact of being extinct or the process of becoming extinct: "The most effective agent in the extinction of species is the pressure of other species” ( Alfred R. Wallace).
  • n. Psychology A reduction or a loss in the strength or rate of a conditioned response when the unconditioned stimulus or reinforcement is withheld.
  • n. Physiology A gradual decrease in the excitability of a nerve to a previously adequate stimulus, usually resulting in total loss of excitability.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The action of making or becoming extinct; annihilation.
  • n. The absorption or scattering of electromagnetic radiation emitted by astronomical objects by intervening dust and gas before it reaches the observer.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of extinguishing or making extinct; a putting an end to; the act of putting out or destroying light, fire, life, activity, influence, etc.
  • n. State of being extinguished or of ceasing to be; destruction; suppression.
  • n. The ceasing to exist of a species of living organism, such as a plant or animal, whose numbers declined to the point where the last member of the species died and therefore no new members of the species could ever again be born.

from The Century Dictionary and Cyclopedia

  • n. The act of extinguishing, or the state of being extinguished; a quenching or putting out, as of fire or flame.
  • n. Hence A bringing or coming to an end; a putting out of existence; suppression; destruction.
  • n. In optics, the arresting of a beam of light by polarization, by the imperfect transparency of the medium, or otherwise.

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

  • n. the reduction of the intensity of radiation as a consequence of absorption and radiation
  • n. no longer active; extinguished
  • n. complete annihilation
  • n. no longer in existence
  • n. the act of extinguishing; causing to stop burning
  • n. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus


from Wiktionary, Creative Commons Attribution/Share-Alike License

From French extinction, from Latin extinctio ("extinction, annihilation"), from extinguere, past participle extinctus ("to extinguish"); see extinguish.



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