Xmas

Etymology
Attested in this form since 1755, and preceded by earlier forms such as (1551) and  (1100), from, with abbreviation of  by the symbol , , from. . In popular use since late 19th century. See Wikipedia for more information.

Pronunciation
Pronounced as either or :

Usage notes
Discouraged in formal usage, and as of late 20th century considered disrespectful by some Christians, due to the absence of the word.

See Xmas: Style guides and etiquette for further discussion.