non-
/nɒn
/prefix
1Expressing negation or absence: non-aggression non-recognition
1.1Not of the kind or class described: non-believer nonconformist
1.2Not of the importance implied: non-issue
2(Added to adverbs) not in the way described: non-uniformly
3(Added to verbs to form adjectives) not causing or requiring: non-skid non-iron
4Expressing a neutral negative sense when a corresponding form beginning with in- or un- has a special connotation (such as non-human compared with inhuman).
Usage
The prefixes non- and un- both have the meaning ‘not’, but tend to be used with a difference of emphasis. See un-1 (usage).
Origin
From Latin non 'not'.