History and Etymology for non -. Middle English, from Anglo-French, from Latin non not, from Old Latin noenum, from ne-not + oinom, neuter of oinos one — more at no, one Non - definition, 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. See more. non - pref. Not: herebatant. [Middle English, from Old French, from Latin nōn, not; see ne in Indo-European roots.] 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,

Disclaimer. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. An example of non used as an interjection is in the sentences, Non ! I don't want to go to the park today! which means No! I don't want to go to the park today! Disclaimer. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only.