[ac.cus.tom] vt [ME, fr. MF acostumer, fr. a- (fr. L ad-) + costume custom] (15c): to make familiar with something through use or experience -- ac.cus.tom.ation n
ACCUSTOM
Meaning of ACCUSTOM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012