WordReference Random House Learner's Dictionary of American English © 2026
mm,  an abbreviation of:
  1. Weights and Measuresmillimeter.

MM.,  an abbreviation of:
  1. Messieurs.

Collins Concise English Dictionary © HarperCollins Publishers::
mm symbol for
  1. millimetre
WordReference Random House Learner's Dictionary of American English © 2026
M, m /ɛm/USA pronunciation   n. [countable], pl. Ms or M's, ms or m's. 
  1. Linguisticsthe 13th letter of the English alphabet, a consonant.

M,  an abbreviation of:
  1. Physicsmach.
  2. Biochemistrymarried.
  3. medium.
  4. mega-.

M,  Symbol.
  1. the 13th in order or in a series.
  2. the Roman numeral for 1000.

m,  an abbreviation of:
  1. Physicsmass.
  2. medium.
  3. Weights and Measuresmeter.
  4. middle.

M.,  an abbreviation of:
  1. majesty.
  2. Music and Dancemeasure.
  3. medicine.
  4. medium.
  5. meridian.
  6. Monday.
  7. Foreign Termspl. MM. messieurs.

m.,  an abbreviation of:
  1. male.
  2. married.
  3. masculine.
  4. Physicsmass.
  5. medium.
  6. Latin merīdiēs noon.
  7. Weights and Measuresmeter.
  8. middle.
  9. Weights and Measuresmile.
  10. minute.
  11. morning.

WordReference Random House Unabridged Dictionary of American English © 2026
mM, 
  1. Physicsmillimole;
    millimoles.

mm, 
  1. Weights and Measuresmillimeter;
    millimeters.

MM., 
  1. Messieurs.

mm., 
    1. Music and Dancemeasures.
    2. thousands.
      • Latin millia
    3. Weights and Measuresmillimeter;
      millimeters.

M.M., 
    1. Master Mason.
    2. Master Mechanic.
    3. EducationMaster of Music.

WordReference Random House Unabridged Dictionary of American English © 2026
M, m  (em),USA pronunciation n., pl. M's or Ms, m's or ms. 
  1. Linguisticsthe thirteenth letter of the English alphabet, a consonant.
  2. Linguisticsany spoken sound represented by the letter M or m, as in my, summer, or him.
  3. something having the shape of an M.
  4. a written or printed representation of the letter M or m.
  5. Printinga device, as a printer's type, for reproducing the letter M or m.
  6. Printingem.

M, 
    1. Physicsmach.
    2. Music and Dancemajor.
    3. Electricitymale.
    4. Biochemistrymarried.
    5. Medieval.
    6. medium.
    7. mega-.
    8. Middle.
    9. modal auxiliary.
    10. modifier.
    11. Economics, Businessmonetary aggregate: issued periodically by the Federal Reserve Board as various measures of money supply (M-1, M-1A, M-2, etc.). Cf. L. 
    12. British Termsmotorway (used with a road number to designate a major highway):the M1.

M, [Symbol.]
  1. the thirteenth in order or in a series, or, when I is omitted, the twelfth.
  2. (sometimes l.c.) the Roman numeral for 1000. Cf. Roman numerals. 
  3. [Elect.]magnetization.
  4. Biochemistrymethionine.

m, 
    1. Physicsmass.
    2. Business[Finance.](of bonds) matured.
    3. medieval.
    4. medium.
    5. Weights and Measuresmeter;
      meters.
    6. middle.
    7. [Music.]minor.

m, 
  1. [Symbol, Elect.]magnetic pole strength.

M-, 
  1. Military[U.S. Mil.](used to designate the production model of military equipment, as the M-1 rifle.)

m-, 
  1. meta-.

M'-, 
  1. var. of Mac-. 

M., 
    1. Majesty.
    2. Place NamesManitoba.
    3. markka;
      markkaa.
    4. Marquis.
    5. Music and Dancemeasure.
    6. medicine.
    7. medium.
    8. meridian.
    9. noon.
      • Latin merīdiēs
    10. Monday.
    11. Foreign Termspl MM. Monsieur.
    12. mountain.

m., 
    1. male.
    2. Currency(in Germany) mark;
      marks.
    3. married.
    4. masculine.
    5. Physicsmass.
    6. medium.
    7. noon.
      • Latin merīdiēs
    8. Weights and Measuresmeter.
    9. middle.
    10. Weights and Measuresmile.
    11. minute.
    12. Drugs(in prescriptions) mix.
      • Latin merīdiēs
    13. modification of.
    14. modulus.
    15. Chemistrymolar.
    16. month.
    17. moon.
    18. morning.
    19. mouth.

Collins Concise English Dictionary © HarperCollins Publishers::
MM abbreviation for
  1. Military Medal
  2. the French equivalent of Messrs
Etymology: from French Messieurs
'mm' also found in these entries (note: many are not synonyms or translations):
A4 - artillery - atmosphere - demy - drizzle - Luger - M. - Owen gun - plastic bullet - Sahara - sand - Sten gun - tuff - anamorphic lens - atmospheric pressure - barley coal - barleycorn - buckwheat coal - cicero - corps - Didot point system - eightpenny - em pica - hail - heavy artillery - helium - HO gauge - hydrogen - ice pellets - infrared - light artillery - light machine gun - M, m - machine bolt - machine screw - macroplankton - mesoplankton - microwave - mil - millimeter - millimole - mm Hg - neon - nitrogen - O gauge - OO gauge - open-reel tape - oxygen - pegwood - rain

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