M, m

[ em ]
/ ɛm /

noun, plural M's or Ms, m's or ms.

the thirteenth letter of the English alphabet, a consonant.
any spoken sound represented by the letter M or m, as in my, summer, or him.
something having the shape of an M.
a written or printed representation of the letter M or m.
a device, as a printer's type, for reproducing the letter M or m.
Printing. em.

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a granular metamorphic rock.
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a hobble or fetter for a horse or other animal.
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Definition for m (2 of 17)

m

Definition for m (3 of 17)

m

Symbol, Electricity. magnetic pole strength.

Definition for m (4 of 17)

M

Definition for m (5 of 17)

M

Symbol.

the thirteenth in order or in a series, or, when I is omitted, the twelfth.
(sometimes lowercase) the Roman numeral for 1000.Compare Roman numerals.
Electricity. magnetization.
Biochemistry. methionine.

Definition for m (6 of 17)

Mac-

a prefix found in many family names of Irish or Scottish Gaelic origin, as MacBride and Macdonald.
Also Mc- Mc-, M'-.

Origin of Mac-

< Irish, Scots Gaelic mac son, Old Irish macc; akin to Welsh, Cornish mab

Definition for m (7 of 17)

'm
[ m ]
/ m /

contraction of am: I'm not thirsty.

Definition for m (8 of 17)

m-

meta-.
(referring especially to the use of wireless electronic devices) mobile: m-commerce; m-business.

Definition for m (9 of 17)

M-

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

Definition for m (10 of 17)

M'-

variant of Mac-.

Definition for m (11 of 17)

m.1

noon.

Origin of m.

1
From the Latin word merīdiēs

Definition for m (12 of 17)

m.2

(in prescriptions) mix.

Origin of m.

2
From the Latin word misce

Definition for m (13 of 17)

m.3

Definition for m (14 of 17)

M.1

or m.

noon.

Origin of M.

1
From the Latin word merīdiēs

Definition for m (15 of 17)

M.2

Definition for m (16 of 17)

Mc-2

variant of Mac-.
Also Mc-.

Definition for m (17 of 17)

mu
[ myoo, moo ]
/ myu, mu /

noun

the 12th letter of the Greek alphabet (M, μ).
the consonant sound represented by this letter.
micron(def 1).

Origin of mu

First recorded in 1895–1900, mu is from the Greek word mŷ
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for m

British Dictionary definitions for m (1 of 14)

m

M

/ (ɛm) /

noun plural m's, M's or Ms

the 13th letter and tenth consonant of the modern English alphabet
a speech sound represented by this letter, usually a bilabial nasal, as in mat

British Dictionary definitions for m (2 of 14)

m

symbol for

metre(s)
mile(s)
milli-
minute(s)

British Dictionary definitions for m (3 of 14)

M

symbol for

abbreviation for

Malta (international car registration)

British Dictionary definitions for m (4 of 14)

m-

prefix

short for meta- (def. 4)

British Dictionary definitions for m (5 of 14)

m-

prefix

indicating the use of mobile-communications technologym-banking

British Dictionary definitions for m (6 of 14)

m.

abbreviation for

cricket maiden (over)
male
mare
married
masculine

British Dictionary definitions for m (7 of 14)

M.

abbreviation for

Majesty
(in titles) Member
million
Also: M plural MM or MM French Monsieur
mountain

Word Origin for M.

sense 4) French equivalent of Mr

British Dictionary definitions for m (8 of 14)

M'-

prefix

a variant of Mac-

British Dictionary definitions for m (9 of 14)

'm

contraction of

(verb) am
(noun) madamyes'm

British Dictionary definitions for m (10 of 14)

Mc-

prefix

a variant of Mac-

usage for Mc-

For names beginning with this prefix, see under Mac-

British Dictionary definitions for m (11 of 14)

mu1
/ (mjuː) /

noun

the 12th letter in the Greek alphabet (Μ, μ), a consonant, transliterated as m

British Dictionary definitions for m (12 of 14)

mu2

the internet domain name for

Mauritius

British Dictionary definitions for m (13 of 14)

MU

abbreviation for

Musicians' Union

British Dictionary definitions for m (14 of 14)

Mac-

Mc- or M'-

prefix

(in surnames of Scottish or Irish Gaelic origin) son ofMacDonald; MacNeice

Word Origin for Mac-

from Goidelic mac son of; compare Welsh mab, Cornish mab
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for m (1 of 5)

m

abbr.

mass
meter

Medical definitions for m (2 of 5)

M

abbr.

molar1
molarity
morgan
myopia

Medical definitions for m (3 of 5)

m-

abbr.

meta-

Medical definitions for m (4 of 5)

mu
[ myōō, mōō ]

n.

The 12th letter of the Greek alphabet.

adj.

Of, relating to, or being a polypeptide chain that is one of five types of heavy chains present in immunoglobins.

Medical definitions for m (5 of 5)

Mu

abbr.

Mache unit
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for m

m

Abbreviation of mass, meter
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.