Etymology

custom

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Today it means: Frequent repetition of the same behavior; way of behavior common to many; ordinary manner; habitual practice; method of doing, living or behaving. Full definition →

Middle English custume ← Anglo-Norman custume ← Latin consuētūdinem
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The story

  1. Latin · derived fromconsuētūdinem
  2. Anglo-Norman · derived fromcustume
  3. Middle English · inherited fromcustume
  4. English todaycustom

PIE word *ḱóm PIE word *swé From Middle English custume, borrowed from Anglo-Norman custume, inherited from Latin consuētūdinem, a noun derived from cōnsuēscō, from con- (“with”) + suēscō (“become used or accustomed to”). Displaced native Old English ġewuna and sidu. Doublet of costume, consuetude, and kastom. The adjectival form first appears c. 1830.

Etymology from Wiktionary, CC BY-SA 4.0.