Pronunciation: (hu-bich"OO-ā'shun), [key]
1. the act of habituating.
2. the condition of being habituated.
3. physiological tolerance to or psychological dependence on a drug, short of addiction.
4. reduction of psychological or behavioral response occurring when a specific stimulus occurs repeatedly.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.