em

[ em ]
/ ɛm /

noun, plural ems.

the letter M, m.
Also called mut, mutton. Printing.
  1. the square of any size of type used as the unit of measurement for matter printed in that type size.
  2. (originally) the portion of a line of type occupied by the letter M in type of the same size.

adjective

Printing. having the area of an em quad or the length of an em dash.

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Origin of em

First recorded in 1860–65

Definition for em (2 of 7)

'em
[ uhm ]
/ əm /

pronoun Informal.

them: Put 'em down there.

Origin of 'em

First recorded in 1350–1400; Middle English hem, Old English heom, dative and accusative plural of he1

Definition for em (3 of 7)

Em

Symbol, Physical Chemistry.

Definition for em (4 of 7)

EM

Definition for em (5 of 7)

em-1

variant of en-1 before b, p, and sometimes m:embalm.
Compare im-1.

Definition for em (6 of 7)

em-2

variant of en-2 before b, m, p, ph:embolism, emphasis.

Definition for em (7 of 7)

E.M.

Earl Marshal.
Engineer of Mines.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for em (1 of 3)

em
/ (ɛm) /

noun printing

Also called: mutton, mut the square of a body of any size of type, used as a unit of measurement
Also called: pica em, pica a unit of measurement used in printing, equal to one sixth of an inch

Word Origin for em

C19: from the name of the letter M

British Dictionary definitions for em (2 of 3)

'em
/ (əm) /

pronoun

an informal variant of them

British Dictionary definitions for em (3 of 3)

em-

prefix

before b, m, and p, a variant of en- 1, en- 2
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 em (1 of 2)

EM

abbr.

electron microscope

Medical definitions for em (2 of 2)

em-

pref.

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