Dictionary
not
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! not-
var. of
noto- before a vowel.
NOT
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.