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[uh-kuhs-tuh m] /əˈkʌs təm/
verb (used with object)
to familiarize by custom or use; habituate:
to accustom oneself to cold weather.
Origin of accustom
late Middle English
1425-75; late Middle English < Middle French acoustumer. See ac-, custom
Related forms
preaccustom, verb (used with object)
reaccustom, verb (used with object)
unaccustom, verb (used with object) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for accustom


(transitive) usually foll by to. to make (oneself) familiar (with) or used (to), as by practice, habit, or experience
Word Origin
C15: from Old French acostumer, from costumecustom
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for accustom

early 15c., from Old French acostumer (12c., Modern French accoutumer), from à "to" (see ad-) + costume (see costume (n.)). Related: Accustomed; accustoming.

Online Etymology Dictionary, © 2010 Douglas Harper
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