From Longman Dictionary of Contemporary EnglishMM, m /em/ (plural M’s, m’s) noun 1 SLA[countable, uncountable] the 13th letter of the English alphabet2 HMN[countable] the number 1,000 in the system of roman numerals3 → M6, M25 etcmm (also m.) 1 the written abbreviation of metre or metres2 the written abbreviation of mile or miles3 the written abbreviation of million4 the written abbreviation of male5 the written abbreviation of married6 the written abbreviation of medium, used on clothes to mean an average sizeFrom Longman Business Dictionarymm written abbreviation for METRE(S); MILE(S); MILLION
