not: Meaning and Definition of

not

1. (used to express negation, denial, refusal, or prohibition): You must not do that. It's not far from here.
2. (used jocularly as a postpositive interjection to indicate that a previous statement is untrue): That's a lovely dress. Not!

not-

1. var. ofbefore a vowel.

NOT

1. a Boolean operator that returns a positive result if its operand is negative and a negative result if its operand is positive.