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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 of non-
prefix representing L adv. nōn not Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for non-


indicating negation: nonexistent
indicating refusal or failure: noncooperation
indicating exclusion from a specified class of persons or things: nonfiction
indicating lack or absence, esp of a quality associated with what is specified: nonobjective, nonevent
Word Origin
from Latin nōn not
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
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Word Origin and History for non-

prefix meaning "not, lack of," or "sham," 14c., from Anglo-French noun-, from Old French non-, from Latin non "not, by no means, not at all, not a," from Old Latin noenum "not one" (*ne oinom, from PIE *ne "not" + *oi-no-; see one). In some cases perhaps from Middle English non "not" (adj.), from Old English nan (see not).

Online Etymology Dictionary, © 2010 Douglas Harper
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non- in Medicine

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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