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il-1

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  1. variant of in-2 (by assimilation) before l: illation.

il-2

  1. variant of in-3 (by assimilation) before l: illogical.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for il-

il-

prefix
  1. variant of in- 1, in- 2
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 il-

assimilated form of Latin prefix in- used with words beginning in l-; see in-.

Online Etymology Dictionary, © 2010 Douglas Harper