Main Entry: ha·bit·u·a·tion

Pronunciation: \-ˌbich-ə-ˈwā-shən\

Function: noun

1 : the act or process of making habitual or accustomed
2 a : tolerance to the effects of a drug acquired through continued use b : psychological dependence on a drug after a period of use—compare addiction
3 : a form of nonassociative learning characterized by a decrease in responsiveness upon repeated exposure to a stimulus—compare sensitization 3