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

1275–1325; Middle English; weak variant of nought

knot, not. Unabridged


variant of noto- before a vowel.


a Boolean operator that returns a positive result if its operand is negative and a negative result if its operand is positive. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To not
World English Dictionary
not (nɒt)
1.  a.  used to negate the sentence, phrase, or word that it modifies: I will not stand for it
 b.  (in combination): they cannot go
2.  (conjunction) not that Also (archaic): not but what which is not to say or suppose that: I expect to lose the game — not that I mind
sentence substitute
3.  used to indicate denial, negation, or refusal: certainly not
[C14 not, variant of nought nothing, from Old English nāwiht, from no + wiht creature, thing. See naught, nought]

combining form
a variant of noto-

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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. Shinola was a brand of shoe polish. Double negative construction not un- was derided by Orwell, but is persistent and ancient in English, popular with Milton and the Anglo-Saxon poets.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

NOT definition

The Boolean function which is true only if its input is false. Its truth table is:
A | NOT A --+---------- F | T T | F

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Idioms & Phrases


In addition to the idioms beginning with not, also see all that glitters is not gold; (not) all there; (not) at all; believe it or not; caught dead, not be; (not a) Chinaman's chance; coming or going, not know if; do as I say (not as I do); game is not worth the candle; heart (not) in it; hold one's breath, not; (not) in the least; (not) in the mood; it's (not) your funeral; last but not least; like as not; living soul, not a; mince matters, not to; more often than not; (not) move a muscle; no problem (not to worry); (not to) sneeze at; (not) take no for an answer; (not) the half of it; (not) turn a hair; two wrongs do not make a right; waste not, want not; whether or not; without a (not a) leg to stand on; won't (will not) hear of. For verbal phrases also see under can't; couldn't; wouldn't.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Experts say it's probably not the mattress that keeps you up at night.
Money can bring you happiness, studies show, but not as much as you might think.
Of course, if not done completely, the result is trans fat.
Also weird is that while borrowing from one language to another is common,
  borrowing grammar is not nearly as common.
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