Pronunciation: (not),[key] —adv. 1. (used to express negation, denial, refusal, or prohibition): You must not do that. It's not far from here. 2. U.S. Slang. (used jocularly as a postpositive interjection to indicate that a previous statement is untrue): That's a lovely dress. Not!
var. of noto- before a vowel.
Pronunciation: (not),[key] —n. a Boolean operator that returns a positive result if its operand is negative and a negative result if its operand is positive.