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The definition of Christmas

3 Definitions of: Christmas

1. noun, a) the annual commemoration by Christians of the birth of Jesus Christ on Dec 25 b)Also called: Christmas Day Dec 25, observed as a day of secular celebrations when gifts and greetings are exchanged c) (as modifier)
2. noun, Also called: Christmas Day (in England, Wales and Ireland) Dec 25, one of the four quarter days. Compare Lady Day, Midsummer's Day, Michaelmas
3. noun, Also called: Christmastide the season of Christmas extending from Dec 24 (Christmas Eve) to Jan 6 (the festival of the Epiphany or Twelfth Night)
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5. Show me the etymology of the word: Christmas

Synonyms:	informal archaic archaic yule, Noel, Xmas

From Collins