em Meaning, Definition & Usage
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noun a quad with a square body
em quad; mutton quad.
- since `em quad' is hard to distinguish from `en quad', printers sometimes called it a `mutton quad'
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noun a linear unit (1/6 inch) used in printing
pica em; pica.
WordNet
Em noun
Definitions
(Print.) The portion of a line formerly occupied by the letter m, then a square type, used as a unit by which to measure the amount of printed matter on a page; the square of the body of a type.