From The Collaborative International Dictionary of English v.0.48 [gcide]:
Christmas \Christ"mas\, noun [Christ + mass.] An annual church festival (December 25) and in some States a legal holiday, in memory of the birth of Christ, often celebrated by a particular church service, and also by special gifts, greetings, and hospitality.
From WordNet (r) 3.0 (2006) [wn]:
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