What does non mean?
Non is principally an English combining form meaning “not” or “the opposite of.” Attached to another word, it creates expressions such as non-smoker, non-profit, non-verbal, and non-existent. The prefix is productive and largely neutral in register, although hyphenation can vary according to the compound and the style guide being followed. Non can also function as an informal noun for a person who is outside a particular group: someone who is not a member, supporter, or participant may be called a non. This standalone use is less common than the prefixed forms and is often less precise than a fuller description. The word is especially useful when a category needs a brief, familiar label, but explicit wording may be preferable in formal or legal contexts. Its Latin origin, from non meaning “not,” remains evident in related English words such as none, null, negation, and negative.
Meaning “not,” “other than,” or “the opposite of,” especially when forming an adjective or related noun.
"The hotel offers non-smoking rooms and explains its non-profit status on its website."
A person who does not belong to a particular group, category, or organization.
"At first she was a non, but the campaign persuaded her to join."
The plural of the informal noun is uncommon because more explicit terms are often preferred in formal writing.
"The forum was open to members and nons alike."
Latin non meant “not”; three letters later, it was still carrying the weight—and it remains one of English’s most productive prefixes.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does non come from?
Non comes from Latin non, meaning “not,” which continues Proto-Indo-European *ne- with the same basic sense. English none developed through Old French non and is a close historical cognate, while Latin forms built on the same negative root include nullus, meaning “not any,” and negare, meaning “to deny,” reflected in English null, negation, and negative. The English combining form non- became highly productive and could also be used informally as a noun for a person outside a category.
How non is actually used
The prefix is neutral in register and is normally written with a hyphen when attached to a following word, although conventions vary for some compound words. The standalone noun is informal and relatively uncommon; an explicit term such as outsider, non-member, or unaffiliated person is often clearer.
Easily confused with non
None is a word meaning “not any” that functions as a pronoun or determiner; non is a prefix meaning “not” and can also be an informal noun for someone outside a category.