"accustom, make familiar," 1520s, from Late Latin habituatus, past participle of habituare "to bring into a condition or habit of the body," from Latin habitus "condition, appearance, dress," originally past participle of habere "to have, hold, possess; wear; find oneself, be situated; consider, think, reason, have in mind; manage, keep," from PIE root *ghabh- "to give or receive." Related: Habituated; habituating.