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.

Nearby words

  1. non rep.,
  2. non repetatur,
  3. non seq.,
  4. non sequitur,
  5. non troppo,
  6. non-a hepatitis,
  7. non-a, non-b hepatitis,
  8. non-aggression,
  9. non-aligned,
  10. non-art

Origin of non-

prefix representing L adv. nōn not Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for non-



indicating negationnonexistent
indicating refusal or failurenoncooperation
indicating exclusion from a specified class of persons or thingsnonfiction
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

Medicine definitions for non-




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