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im-

1
  1. variant of in-2 before b, m, p: imbrute; immigrate; impassion.
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im-

2
  1. variant of in-3 before b, m, p: imbalance; immoral; imperishable.
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im-

3
  1. variant of in-1 before b, m, p: imbed; immure; impose.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for im-

im-

prefix
  1. a variant of in- 1, in- 2
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for im-

variant of in- before -b-, -m-, -p-, in the sense of "not, opposite of" (immobile, impersonal) as well as "in, into" (implant, impoverish). See in-. In some English words it alternates with em- (1).

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Online Etymology Dictionary, © 2010 Douglas Harper