customary; usual; habitual: in their accustomed manner.
habituated; acclimated (usually followed by to ): accustomed to staying up late; accustomed to the noise of the subway.

1400–50; late Middle English; see accustom, -ed2

accustomedly, adverb
accustomedness, noun
half-accustomed, adjective
well-accustomed, adjective

1. characteristic, normal, regular. 2. used (to).

1. unusual. 2. unused (to). Unabridged


verb (used with object)
to familiarize by custom or use; habituate: to accustom oneself to cold weather.

1425–75; late Middle English < Middle French acoustumer. See ac-, custom

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. 2014.
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World English Dictionary
accustom (əˈkʌstəm)
vb (usually foll by to)
to make (oneself) familiar (with) or used (to), as by practice, habit, or experience
[C15: from Old French acostumer, from costumecustom]

accustomed (əˈkʌstəmd)
adj (foll by to) (foll by to)
1.  usual; customary
2.  used or inured (to)
3.  in the habit (of): accustomed to walking after meals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., from M.Fr. acostumer, from à "to" + costume (see costume).

late 15c., "made customary, habitual," pp. adj. formed from accustom (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They had their accustomed table and waiter, and the former was always as
  prepared as the latter was prompt.
They are intensely patriotic but accustomed to globalization.
University trustees are generally drawn from a business background and are
  accustomed to corporate plans.
We're accustomed to borrowing from animals and plants when it comes to clothing
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