plural Xmases
Definition of Xmas
informal
: christmas
I don't expect to get away for Xmas.— Alexander Woollcott Lester was carrying boxes marked Xmas from the corner of the garage to the truck.— Gloria Naylor
—now used chiefly for brevity in advertisements, headlines, etc.
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Merriam-Webster unabridged
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Time Traveler for Xmas
The first known use of Xmas was in 1721
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