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

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m the thirteenth letter of the English alphabet.
M2 in Roman numeral notation, 1,000.
M-1 the basic .30-caliber U.S. military rifle used in World War II and the Korean War, which is semiautomatic and uses a clip.
M.S. abbreviation of "Master of Science," a master's degree awarded usu. in science, technology, or mathematics.
Mississippi a U.S. state on the Gulf of Mexico between Alabama and Louisiana. (abbr.: MS) [2 definitions]
MS1 abbreviation of "Mississippi," a U.S. state on the Gulf of Mexico between Alabama and Louisiana.
MS2 abbreviation of "multiple sclerosis," a degenerative disease of the nervous system in which nerve cells of the brain or spinal cord lose their myelin sheaths, resulting in hardening of the neural tissue, speech difficulties, and loss of muscular coordination.
MS3 abbreviation of "manuscript," a text as prepared by the author to submit for publication.
Ms. a conventional title of courtesy often used before the surname of a single or married woman.