Etymology

accustom

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Today it means: To make familiar by use; to cause to accept; to habituate, familiarize, or inure. Full definition →

Middle English accustomen ← Old French acoustumer
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The story

  1. Middle English · inherited fromacustom
  2. Old French · derived fromacoustumer
  3. Middle English · inherited fromaccustomen
  4. English todayaccustom

The verb is from Middle English accustomen, from Old French acoustumer, acustumer (Modern French accoutumer) corresponding to a (“to, toward”) + custom. More at custom, costume. The noun is from Middle English acustom.

Etymology from Wiktionary, CC BY-SA 4.0.