n.
- The process of habituating or the state of being habituated.
- Physiological tolerance to a drug resulting from repeated use.
- Psychological dependence on a drug.
- Psychology. The decline of a conditioned response following repeated exposure to the conditioned stimulus.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.