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See also: em-

em

1 of 3

noun

1
: the letter m
2
: the width of a piece of type about as wide as it is tall used as a unit of measure of typeset matter

EM

2 of 3

abbreviation

1
electromagnetic
2
electron microscope; electron microscopy
3
end matched
4
engineer of mines
5
enlisted man

em-

3 of 3

prefix

see en-

Word History

First Known Use

Noun

13th century, in the meaning defined at sense 1

Time Traveler
The first known use of em was in the 13th century

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