Definition of

M

  1. (noun, quantity) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)
  2. (noun, attribute) concentration measured by the number of moles of solute per liter of solution
  3. (noun, quantity) the cardinal number that is the product of 10 and 100
  4. (noun, quantity) a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes
  5. (noun, quantity) a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes
  6. (noun, communication) the 13th letter of the Roman alphabet
  7. (adj, all) denoting a quantity consisting of 1,000 items or units

via WordNet, Princeton University

Origin of the word M

  1. from Gk. mu, from Semitic mem. The Roman symbol for 1,000; sometimes used in this sense in English 15c.-16c.; but in modern newspaper headlines it stands for million. more

via Online Etymology Dictionary, ©2001 Douglas Harper

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