Webster's English Dictionary

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christmas

Christ.mas \'kris-m*s\ n [ME Christemasse, fr. OE Cristes msse, lit., 
   Christ's mass] 1: a Christian feast on December 25 or among the Armenians 
   on January 6 tha t commemorates the birth of Christ and is usu. observed as 
   a legal holiday 2: CHRISTMASTIDE