Not

[not] /nɒt/

adverb
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):
I just love working overtime without pay. Not!
Idioms
3.
not so much, Informal. (an expression of dismissive scorn, ambivalence, or skepticism): Attractive? Yes. Smart? Not so much.
Is the world coming to an end? Yeah, not so much.
[not] /nɒt/
noun
1.
a Boolean operator that returns a positive result if its operand is negative and a negative result if its operand is positive.
1.
variant of before a vowel.
/nɒt/
adverb
1.

2.
(conjunction) not that, which is not to say or suppose that: I expect to lose the game — not that I mind Also (archaic) not but what
sentence substitute
3.
used to indicate denial, negation, or refusal: certainly not
combining form
1.
a variant of noto-

negative particle, mid-13c., unstressed variant of noht, naht “in no way” (see naught). As an interjection to negate what was said before or reveal it as sarcasm, it is first attested 1900; popularized 1989 by “Wayne’s World” sketches on “Saturday Night Live” TV show. To not know X from Y (one’s ass from one’s elbow, shit from Shinola, etc.) was a construction first attested c.1930. Double negative construction not un- was derided by Orwell, but is persistent and ancient in English, popular with Milton and the Anglo-Saxon poets.

negation

What has just been stated is emphatically not true: Millions of animals in experimental labs die annually. Shock value? NOT!/ Hooray for Pat Buchanan, not!/ Dan Quayle has already filmed a commercial declaring Murphy Brown his favorite show …”not” (1990s+)

logic
The Boolean function which is true only if its input is false. Its truth table is:
A | NOT A –+———- F | T T | F
(1996-11-04)