a prefix meaning “not,” freely used as an English formative, usually with a simple negative force as implying mere negation or absence of something (rather than the opposite or reverse of it, as often expressed by un-1. ): nonadherence; noninterference; nonpayment; nonprofessional .

prefix representing L adv. nōn not Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  indicating negation: nonexistent
2.  indicating refusal or failure: noncooperation
3.  indicating exclusion from a specified class of persons or things: nonfiction
4.  indicating lack or absence, esp of a quality associated with what is specified: nonobjective; nonevent
[from Latin nōn not]

nona- or (before a vowel) non-
combining form
nine: nonagon
[from Latin nōnus]
non- or (before a vowel) non-
combining form
[from Latin nōnus]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

prefix meaning "not, lack of," or "sham," 14c., from Anglo-Fr. noun-, from O.Fr. non-, from L. non "not, not a," from Old L. noenum "not one" (*ne oinom). In some cases perhaps from M.E. non "not" (adj.), from O.E. nan (see not).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

non- pref.
Not: noninvasive.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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