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M1 / em/ (also m) • n. (pl. Ms or M's) 1. the thirteenth letter of the alphabet.See also em. ∎  denoting the next after L in a set of items, categories, etc.2. (M) a shape like that of a capital M.3. the Roman numeral for 1,000.M2 • abbr. ∎  Majesty. ∎  male. ∎  Manitoba. ∎  markka; markkas. ∎  Marquis. ∎  Mus. measure. ∎  medicine. ∎  medium (as a clothes size). ∎  [in comb.] (in units of measurement) mega-: 8 Mbytes of memory. ∎  meridian. ∎  Astron. Messier (catalog of nebulae): the galaxy M33. ∎  Chem. (with reference to solutions) molar: 0.15 M NaCl solution. ∎  Monday. ∎  Monsieur: M Chirac. ∎  money, when used with a following numeral in measures of money supply: broad money, M3, grew by an annualized 9.7%. ∎  mountain. ∎  noon.M3 • symb. Physics mutual inductance.

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