Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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m the thirteenth letter of the English alphabet.
M1 abbreviation of "medium," middle or intermediate in size or degree.
M2 in Roman numeral notation, 1,000.
M3 abbreviation of "male."
M- used with a number to denote equipment produced for U.S. military use, such as the M-16 rifle.
M. abbreviation of "Monsieur," the French title of respect and term of address for a man, corresponding to "Mister" or "Sir".
m.1 abbreviation of "meter," or "meters," the basic unit of length of the metric system, equal to one hundred centimeters or 3.28 feet.
m.2 abbreviation of "mass," in physics, the quality of a body that determines its resistance to acceleration.
masc. abbreviation of "masculine."