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Noun: habituation  hu,bi-choo'ey-shun
  1. Being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)
    - addiction, dependence, dependance, dependency
  2. A general accommodation to unchanging environmental conditions

Derived forms: habituations

Type of: accommodation, adjustment, fitting, physical condition, physiological condition, physiological state

Encyclopedia: Habituation