accustom /əˈkʌs.təm/verb 3noun 1forms 5 verb3 •To make familiar by use; to cause to accept; to habituate, familiarize, or inure.Early exposure to pet allergens and pet-related bacteria accustoms the body to allergens. •(no longer used) To be wont. •(no longer used) To cohabit.Much better do we Britans fulfill the work of Nature than you Romans; we with the best men accustom op'nly; you with the basest commit private adulteries. — 1670 noun1 •(no longer used) Custom. formsaccustomed · accustoming · accustometh · accustoms · accustomest