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[uh-kuhs-tuh m]
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verb (used with object)
  1. to familiarize by custom or use; habituate: to accustom oneself to cold weather.
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Origin of accustom

First recorded in 1425–75; late Middle English word from Middle French word acoustumer. See ac-, custom
Related formspre·ac·cus·tom, verb (used with object)re·ac·cus·tom, verb (used with object)un·ac·cus·tom, verb (used with object)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for unaccustom

Historical Examples

  • Delicate hands, unaccustom'd to reels, To set 'em working a poor body's wheels?

    The Book of Humorous Verse


British Dictionary definitions for unaccustom


  1. (tr usually foll by to) to make (oneself) familiar (with) or used (to), as by practice, habit, or experience
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Word Origin

C15: from Old French acostumer, from costume custom
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

Word Origin and History for unaccustom



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

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Online Etymology Dictionary, © 2010 Douglas Harper