- Noun. (mathematics, logic) A unary operation on logical values that changes true to false, and false to true.
- Adverb. Negates the meaning of the modified verb.
- Adverb. To no degree.
- Conjunction. And not.
- Interjection. (slang) Used to indicate that the previous phrase was meant sarcastically or ironically.
- Noun. Unary logical function NOT, true if input is false, or a gate implementing that negation function.