’em (?m)pron. Informal Them.[From Middle English hem, em, from Old English him, heom, dative and accusative pl. of h?, he; see he1.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.’em (?m) pron an informal variant of themCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014em (?m) n., pl. ems. 1. the letter M, m. 2. the square of any size of type used as the unit of measurement for matter printed in that type size. [1860?65] EM 1. electromagnetic. 2. Engineer of Mines. 3. enlisted man or men. ’em (?m) pron. Informal. them. [1350?1400; Middle English hem, Old English heom, dat. and acc. pl. of he1] em-1 , var. of en- 1 before b, p, and sometimes m: embalm. Compare im- 1. em-2 , var. of en- 2 before b, m, p, ph: embolism; emphasis. E.M. Engineer of Mines. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.