Etymology

adieu

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Today it means: Said to wish a final farewell; goodbye. Full definition →

Middle English adieu ← Old French adieu ← Medieval Latin ad Deum
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The story

  1. Medieval Latin · derived fromad Deum“to God”
  2. Old French · derived fromadieu“to God”
  3. Middle English · inherited fromadieu
  4. English todayadieu

From Middle English adieu also adew, adewe, adue, from Old French adieu (“to God”), a shortening of a Dieu vous comant (“I commend you to God”), from Medieval Latin ad Deum (“to God”). Doublet of adios.

Etymology from Wiktionary, CC BY-SA 4.0.