non-

non-

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 .

Origin:
prefix representing L adv. nōn not

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World English Dictionary
non-
 
prefix
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
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Etymonline
Word Origin & History

non-
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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