accustom

 
Pronunciation: /əˈkʌstəm/

verb

[with object] (accustom someone/thing to)
  • make someone or something accept (something) as normal or usual: I accustomed my eyes to the lenses [with object and infinitive]: sixth-form education is supposed to accustom pupils to think for themselves
  • (be accustomed to) be used to: I am not accustomed to having my word questioned

Origin:

late Middle English: from Old French acostumer, from a- (from Latin ad 'to, at') + costume 'custom'