There are 5 main definitions of m in English:

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m 1

Line breaks: m

abbreviation

1.1Married: m twice; two d
1.3 (m-) [in combination] Chemistry Meta-: m-xylene
1.4Metre(s).
1.5Mile(s).
1.6 [in combination] (In units of measurement) milli-: the generator operated at 40 kV and 100 mA
1.7Million(s): £5 m
1.8Minute(s).

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Mass: E = mc2

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There are 5 main definitions of m in English:

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M 2 Line breaks: M
(also m)

noun (plural Ms or M's)

1The thirteenth letter of the alphabet.
Example sentences
  • I'm 30 and have had the exact same problem for many years -- and only just recently realized dilemma has two M's and no N.
  • Remember, his name has two M's in it.
1.1Denoting the next after L in a set of items, categories, etc.
2The Roman numeral for 1,000.
[From Latin mille]
Example sentences
  • The Roman numerals C and M sometimes did not mean 100 or 1000 (see hundred).
  • What number equals the Roman numeral M?

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There are 5 main definitions of m in English:

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M 3 Line breaks: M

abbreviation

1 Cricket (On scorecards) maiden over(s).
1.1Male.
1.3Medium (as a clothes size).
1.4 [in combination] (In units of measurement) mega-: 8 Mbytes of memory
1.5 Astronomy Messier (catalogue of nebulae): the galaxy M33
1.6 Chemistry (With reference to solutions) molar: 0.15 M NaCl solution
1.7Monsieur: M Chirac
1.8(In UK road designations) motorway: the M25
1.9Used with following numeral in measures of money supply: broad money, M3, grew by an annualized 9.7 per cent

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M-1 4 Syllabification: M-1

Entry from US English dictionary

noun

A .30-caliber semiautomatic clip-fed rifle capable of firing eight rounds before reloading, the standard rifle used by US troops in World War II and the Korean War.

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M-16 5 Syllabification: M-16

Entry from US English dictionary

noun

A lightweight, fully automatic assault rifle that shoots small-caliber bullets at an extremely high velocity, used by US troops after 1966.

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Word of the day innocuous
Pronunciation: ɪˈnɒkjʊəs
adjective
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