Main Entry: ha·bit·u·a·tion

Pronunciation: \-ˌbi-chə-ˈwā-shən, -chü-ˈā-\

Function: noun

Date: 15th century

1 : the process of habituating : the state of being habituated
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 : decrease in responsiveness upon repeated exposure to a stimulus