Xmas (also X-mas) is a common abbreviation of the word Christmas. It is sometimes pronounced /ˈɛksməs/, but Xmas, and variants such as Xtemass, originated as handwriting abbreviations for the typical pronunciation /ˈkrɪsməs/. The 'X' comes from the Greek letter Chi, which is the first letter of the Greek word Christós (‹See Tfd›Greek: Χριστός, translit. Khristós, lit. "anointed, covered in oil"), which became Christ in English.[1] The suffix -mas is from the Latin-derived Old English word for Mass.[2][3]
There is a common misconception that the word Xmas stems from a secularizing tendency to de-emphasize the religious tradition of Christmas,[4][5] by taking the 'Christ' out of "Christmas". Nevertheless, the term's usage dates back to the 16th century, and corresponds to Roman Catholic, Eastern Orthodox, Church of England, and Episcopalian[6] liturgical use of various forms of chi-rho monogram. In English, "X" was first used as a scribal abbreviation for "Christ" in 1100; "X'temmas" is attested in 1551, and "Xmas" in 1721.[7]
The usual suggestion is that 'Xmas' is [...] an attempt by the ungodly to x-out Jesus and banish religion from the holiday.