Science Dictionary
extinction  [%PREMIUM_LINK%]     (ĭk-stĭngk'shən)  Pronunciation Key 
  1. The fact of being extinct or the process of becoming extinct. See more at background extinction, mass extinction.

  2. A progressive decrease in the strength of a conditioned response, often resulting in its elimination, because of withdrawal of a specific stimulus.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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