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6 definitions found
 for M
From The Collaborative International Dictionary of English v.0.48 :

  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.]
        [1913 Webster]
     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.
        [1913 Webster]
     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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  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.
        [1913 Webster]
     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.
           [1913 Webster] 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.
           [1913 Webster]
     2. As a numeral, M stands for one thousand, both in English
        and Latin.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: denoting a quantity consisting of 1,000 items or units
             [syn: thousand, one thousand, 1000, m, k]
      n 1: the basic unit of length adopted under the Systeme
           International d'Unites (approximately 1.094 yards) [syn:
           meter, metre, m]
      2: concentration measured by the number of moles of solute per
         liter of solution [syn: molarity, molar concentration,
      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: a unit of information equal to 1000 kilobytes or 10^6
         (1,000,000) bytes [syn: megabyte, M, MB]
      5: a unit of information equal to 1024 kibibytes or 2^20
         (1,048,576) bytes [syn: megabyte, mebibyte, M, MB,
      6: the 13th letter of the Roman alphabet [syn: M, m]

From The Jargon File (version 4.4.7, 29 Dec 2003) :

      [SI] See quantifiers.

From The Free On-line Dictionary of Computing (30 December 2018) :

     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]
     3.  The abbreviated for of mega-.

From Bouvier's Law Dictionary, Revised 6th Ed (1856) :

  M. When persons were convicted of manslaughter in England, they were 
  formerly marked with this letter on the brawn of the thumb. 
       2. This letter is sometimes put on the face of treasury notes of the 
  United States, and signifies that the treasury note bears interest at the 
  rate of one mill per centum, and not one per centum interest. 13 Peters, 

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