non-

  1. 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-

non-

prefix
  1. indicating negationnonexistent
  2. indicating refusal or failurenoncooperation
  3. indicating exclusion from a specified class of persons or thingsnonfiction
  4. indicating lack or absence, esp of a quality associated with what is specifiednonobjective; nonevent

Word Origin for non-

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

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

non- in Medicine

non-

pref.
  1. Not:noninvasive.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.