Em.

em¹ «ehm», noun, plural ems, adjective.

–n.

1. the letter M, m.

2. Printing. a) the square of the body of any size of type; a unit for measuring the amount of print in a line, page, or other printed matter. It was originally the portion of a line occupied by the letter m. b) a unit of pica type (equal to ¹/₆ inch) used to measure column width, etc.; a pica.

–adj.

an em long or square: »

an em dash, an em quad.

╂[a spelling for M]

'em or em² «uhm», pronoun plural.

Informal. them: »

Up and at 'em, boys!

╂[Middle English 'em, unstressed form of hem, later replaced by them]

em-¹,

prefix. the form of en-¹ (Cf. ↑en-) before b, p, and sometimes m, as in »

embark, employ, emmesh.

em-²,

prefix. the form of en-² (Cf. ↑en-) before b, m, p, ph, as in »

emblem, emphasis.

Em.,

Chemistry. emanation (of radioactive substance).

EM (no periods),

an abbreviation for the following:

1. East Mark (the mark of former East Germany, or ostmark, officially DM East).

2. electromagnetic.

3. electron microscope; electron microscopy.

4. enlisted man or men.

E.M.,

U.S. Engineer of Mines.