habituation

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habituation (hă-bit-yoo-ay-shŏn) n.
1. (in psychology) a simple form of learning consisting of a gradual waning response by the subject to a continuous or repeated stimulus that is not associated with reinforcement.

2. (in pharmacology) the condition of being psychologically dependent on a drug, following repeated consumption. It is marked by reduced sensitivity to its effects and a craving for the drug if it is withdrawn. See also dependence.

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