the annual festival of the Christian church commemorating the birth of Jesus: celebrated on December 25 and now generally observed as a legal holiday and an occasion for exchanging gifts.
A Christian feast commemorating the birth of Jesus.
December 25, the day on which this feast is celebrated.
Christmastide.
[Middle English Cristemas, from Old English Crīstes mæsse, Christ's festival : Crīst, Christ; see Christ + mæsse, festival; see Mass.] Christ'mas·sy, Christ'mas·y adj.