Etymology
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accustom (v.)

"familiarize by custom or use," early 15c., accustomen, from Old French acostumer "become accustomed; accustom, bring into use" (12c., Modern French accoutumer), from à "to" (see ad-) + verb from costume "habit, practice" (see custom (n.)). Related: Accustomed; accustoming.

updated on September 13, 2022

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Definitions of accustom from WordNet

accustom (v.)
make psychologically or physically used (to something);
Synonyms: habituate
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.