christmas Meaning, Definition & Usage

  1. noun period extending from Dec. 24 to Jan. 6
    Yuletide; Christmastide; Christmastime; Yule; Noel.
  2. noun a Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland
    Dec 25; Christmas Day; Xmas.

WordNet

Christ"mas noun
Etymology
Christ + mass.
Definitions
  1. 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.

Webster 1913