Definition: m

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Source: WordNet (r) 1.7 

m
     adj : denoting a quantity consisting of 1,000 items or units [syn:
            thousand, a thousand, one thousand, 1000, k]
     n 1: the basic unit of length adopted under the System
          International d'Unites (approximately 1.094 yards) [syn:
           meter, metre]
     2: concentration measured by the number of moles of solute per
        liter of solvent [syn: molarity, molar concentration,
        M]
     3: the cardinal number that is the product of 10 and 100 [syn:
        thousand, one thousand, 1000, M, K, chiliad, G,
         grand, thou, yard]
     4: the 13th letter of the Roman alphabet [syn: M]

Source: Webster's Revised Unabridged Dictionary (1913) 

M \M\ ([e^]m).
   1. M, the thirteenth letter of the English alphabet, is a
      vocal consonant, and from the manner of its formation, is
      called the labio-nasal consonant. See Guide to
      Pronunciation, [sect][sect] 178-180, 242.

   Note: The letter M came into English from the Greek, through
         the Latin, the form of the Greek letter being further
         derived from the Ph[oe]nician, and ultimately, it is
         believed, from the Egyptian. Etymologically M is
         related to n, in lime, linden; emmet, ant; also to b. M
         is readily followed by b and p. the position of the
         lips in the formation of both letters being the same.
         The relation of b and m is the same as that of d and t
         to n. and that of g and k to ng.

   2. As a numeral, M stands for one thousand, both in English
      and Latin.
M \M\, n.
   1. (Print.) A quadrat, the face or top of which is a perfect
      square; also, the size of such a square in any given size
      of type, used as the unit of measurement for that type:
      500 m's of pica would be a piece of matter whose length
      and breadth in pica m's multiplied together produce that
      number. [Written also em.]

   2. (law) A brand or stigma, having the shape of an M,
      formerly impressed on one convicted of manslaughter and
      admitted to the benefit of clergy.

   M roof (Arch.), a kind of roof formed by the junction of
      two common roofs with a valley between them, so that the
      section resembles the letter M.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

M

   1. Alternative name for MUMPS.

   2. A C-like language from Silicon Compiler Systems for
   multilevel hardware description.  It is currently available
   in the GDT package from Mentor Graphics.

   [Jargon File]

   (1994-10-26)

   3. <unit> The abbreviated for of mega-.

   (1995-01-10)

Source: Jargon File (4.3.1, 29 Jun 2001) 

M pref. (on units) suff. (on numbers) [SI] See quantifiers.
M$ Common net abbreviation for Microsoft, everybody's least favorite
   monopoly.