Definition of Xmas noun from the Oxford Advanced Learner's Dictionary

 

Xmas

 noun
noun
BrE BrE//ˈkrɪsməs//
 
; NAmE NAmE//ˈkrɪsməs//
 
; BrE BrE//ˈeksməs//
 
; NAmE NAmE//ˈeksməs//
 
[countable, uncountable](informal)
 
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used as a short form of ‘Christmas’, usually in writing A merry Xmas to all our readers! Word OriginX representing the initial chi of Greek Khristos ‘Christ’.
See the Oxford Advanced American Dictionary entry: Xmas