M1Pronunciation: /ɛm/ (also m)Translate M | into French | into German | into Italian | into Spanish Definition of M noun (plural Ms or M's) 1the thirteenth letter of the alphabet. denoting the next after L in a set of items, categories, etc.. 2the Roman numeral for 1,000. [from Latin mille]M in other Oxford dictionaries Definition of M in the US English dictionary
