Definition of Christmas noun from the Oxford Advanced American Dictionary

     

    Christmas

     noun
    noun
    NAmE//ˈkrɪsməs//
     
    [uncountable, countable]
     
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  1. 1 (also Christmas Day) December 25th, the day when Christians celebrate the birth of Christ Christmas dinner/presents
  2. 2 (also Christmastime) the period that includes Christmas Day and the days close to it the Christmas vacation Are you spending Christmas with your family? Merry Christmas and Happy New Year! see also white Christmas
See the Oxford Advanced Learner's Dictionary entry: Christmas