Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To familiarize, as by constant practice, use, or habit.

from The Century Dictionary.

  • noun Custom: as, “individual accustom of life,”
  • To familiarize by custom or use; habituate or inure: as, to accustom one's self to a spare diet; time may accustom one to almost anything; to be accustomed to hard work.
  • Synonyms To habituate, familiarize, inure, harden, train.
  • To be wont or habituated to do anything.
  • To consort or cohabit.

from the GNU version of the Collaborative International Dictionary of English.

  • noun obsolete Custom.
  • transitive verb To make familiar by use; to habituate, familiarize, or inure; -- with to.
  • intransitive verb obsolete To be wont.
  • intransitive verb obsolete To cohabit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive To make familiar by use; to cause to accept; to habituate, familiarize, or inure; -- with to.
  • verb intransitive, obsolete To be wont.
  • verb intransitive, obsolete To cohabit.
  • noun obsolete Custom.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb make psychologically or physically used (to something)

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English accustomen, from Old French acostumer : a-, to (from Latin ad-; see ad–) + costume, custom; see custom.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Old French acoustumer, acustumer (Modern French accoutumer) corresponding to a ("to, toward") + custom. More at custom, costume.

Examples

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