Music. major.
modal auxiliary.
Economics. monetary aggregate: issued periodically by the Federal Reserve Board as various measures of money supply ((M-1, M-1A, M-2) etc.). Compare L.
British. motorway (used with a road number to designate a major highway): the M1.
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World English Dictionary
m or M (ɛm)
n , pl m's, M's, Ms
1.  the 13th letter and tenth consonant of the modern English alphabet
2.  a speech sound represented by this letter, usually a bilabial nasal, as in mat
M or M

symbol for
1.  metre(s)
2.  mile(s)
3.  milli-
4.  minute(s)

symbol for
1.  mach
2.  medium (size)
3.  mega-
4.  currency mark(s)
5.  million
6.  astronomy Messier catalogue; a catalogue published in 1784, in which 103 nebulae and clusters are listed using a numerical system: M13 is the globular cluster in Hercules
7.  Middle
8.  physics modulus
9.  (in Britain) motorway: the M1 runs from London to Leeds
10.  in Australia
 a.  mature audience (used to describe a category of film certified as suitable for viewing by anyone over the age of 15)
 b.  (as modifier): an M film
11.  logic the middle term of a syllogism
12.  physics mutual inductance
13.  chem molar
14.  Roman numeral See Roman numerals 1000
abbreviation for
15.  Malta (international car registration)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

m abbr.

  1. mass

  2. meter

M 2

  1. molar

  2. molarity

  3. morgan

  4. myopia

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
Abbreviation of mass, meter
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
  1. masculine

  2. mass

  3. meter

  4. minute

  5. modulus

  1. em

  2. Maccabees

  3. Mach number

  4. male

  5. Malta (international vehicle ID)

  6. married (as in personal ads)

  7. medium

  8. megabyte

  9. mellow

  10. metal

  11. middle term

  12. million

  13. mint

  14. molar

  15. molarity

  16. moment

  17. Monday

  18. month

  19. more (shortwave transmission)

  20. [heart] murmur

  21. mutual inductance

  22. 1000

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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