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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Em-. A prefix. See En-.
 

From: WordNet (r) 2.0

 em
      n 1: the square of a body of any size of type [syn: mutton, mut]
      2: a linear unit (1/6 inch) used in printing [syn: pica em, pica]