ac·cus·tom (ə-kŭs'təm) tr.v.
ac·cus·tomed, ac·cus·tom·ing, ac·cus·toms To familiarize, as by constant practice, use, or habit: I have accustomed myself to working long hours.
[Middle English accustomen, from Old French acostumer : a-, to (from Latin ad-; see ad-) + costume, custom; see custom.]