Etymology

Christmas Eve

Today it means: The evening before Christmas Day. Full definition →

Middle English Cristemasse eve ← Old English *Cristes mæsseǣfen
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The story

  1. Old English · inherited from*Cristes mæsseǣfen
  2. Middle English · inherited fromCristemasse eve
  3. English todayChristmas Eve

From Middle English Cristemasse eve, from an assumed Old English *Cristes mæsseǣfen.

Etymology from Wiktionary, CC BY-SA 4.0.