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non-

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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 repr. L adv. nōn not
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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non-  
pref.  Not: noncombatant.

[Middle English, from Old French, from Latin nōn, not; see ne in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: non-
Function: prefix
: not : other than : reverse of : absence of
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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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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