habituation
1. [ noun ] (psychology) being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)
Synonyms: dependence dependency addiction
Related terms: physiological_state drug_addiction narcotic
2. [ noun ] (physiology) a general accommodation to unchanging environmental conditions
Related terms: accommodation habituate
Similar spelling:   habitation
  habituate
  habitude