Xmas
WordNet
noun
(1) A Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland
WiktionaryText
Etymology
From . See Wikipedia for more discussion.
Usage notes
Despite evidence of a Greek precedent, the term Christmas being abbreviated as "Xmas" or "X-mas" was uncommon before the mid-to-late 1900s. Many Christians now take offense at this abbreviation, viewing it as a symbol of commercialism.