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em

Syllabification: (em)
Pronunciation: /em/
Definition of em

noun

Printing
  • a unit for measuring the width of printed matter, equal to the height of the type size being used.
  • a unit of measurement equal to twelve points.

Origin:

late 18th century: the letter M represented as a word, since it is approximately this width

em in other Oxford dictionaries

Definition of em in the British & World English dictionary