Question

What four-letter word is an abbreviation often used for the word Christmas?Answer: ( One Word. Begins with 'x', no hyphen.)

Answer 1

xmas

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Answer 2

Xmas is often used as an abbreviation for the word Christmas.  

The word "X" has originated from the Greek word “Chi”, which is referred as "Christ" in English. Where the other part "-mas" is derived from the Latin word used for Mass.

Note that "Xmas” isn’t considered a proper abbreviation of Christmas for a number of  Christians out there. That's it.