"x" in "Xmas" - Many people find the word "Xmas," as an abbreviation for Christmas, offensive. But the history of the word “Xmas” is actually more respectable — and fascinating — than you might suspect.

X in Xmas

What Is the X in Xmas?

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Here’s a holiday surprise that only the dictionary can provide.

Do you find the word “Xmas,” as an abbreviation for Christmas, offensive? Many people do.

You won’t find “Xmas” in church songbooks or even on many greeting cards.

“Xmas” is popularly associated with a trend towards materialism, and sometimes the target of people who decry the emergence of general “holiday” observance instead of particular cultural and religious ritual.

But the history of the word “Xmas” is actually more respectable — and fascinating — than you might suspect. 

First of all, the abbreviation predates by centuries its use in gaudy advertisements.

It was first used in the mid 1500’s. 

X is the Greek letter “chi,” the initial letter in the word Χριστός (“Cristos.”)

And here’s the kicker: Χριστός means “Christ.”

X has been an acceptable representation of the word “Christ” for hundreds of years. This device is known as a christogram.

The “mas” in “Xmas” is the Old English word for “mass.”  (The thought-provoking etymology of “mass” can be found here.) In the same vein, the dignified terms Xpian and Xtian have been used in place of the word “Christian.”

As lovers of the alphabet, we are transfixed by the flexibility of “X.”

The same letter can represent the sacred, the profane (“rated X”), and the unknown (“X-ray “). 

What does the “X: in Xbox stand for?

http://blog.dictionary.com/xmas-christogram/