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Longman Dictionary of Contemporary English
non-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ a non-event
▪ a nonalcoholic drink
▪ The book was filled with non-characters.
The Collaborative International Dictionary
Non-

Non- \Non-\ (n[o^]n-) pref. [L. non, OL. noenu, noenum, fr. neoenum, lit., not one. See None.] A prefix used in the sense of not; un-; in-; as in nonattention, or non-attention, nonconformity, nonmetallic, nonsuit.

Note: The prefix non- may be joined to the leading word by means of a hyphen, or, in most cases, the hyphen may be dispensed with. The list of words having the prefix non- could easily be lengthened.

Douglas Harper's Etymology Dictionary
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).

Wiktionary
non-

Etymology 1 pre. {{non-gloss definition|Used in the sense of (term not English), to negate the meaning of the word to which it is prefixed.}} Etymology 2

pre. (form of prevocalic form nona- English)