Science Dictionary
habituation   (hə-bĭch'-ā'shən)  Pronunciation Key 
  1. The gradual decline of a response to a stimulus resulting from repeated exposure to the stimulus.

  2. Physiological tolerance for a drug resulting from repeated use.

  3. Psychological dependence on a drug resulting from repeated use.

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