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

 

M

 noun
noun
BrE BrE//em//
 
; NAmE NAmE//em//
 
 
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(also m) [countable, uncountable] (pl. Ms, M’s, m’s
BrE BrE//emz//
 
; NAmE NAmE//emz//
 
)
the 13th letter of the English alphabet ‘Milk’ begins with (an) M/‘M’.
See the Oxford Advanced American Dictionary entry: M