not

[not]
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): That's a lovely dress. Not!
Origin:
1275–1325; Middle English; weak variant of nought

Can be confused: knot, not.
Dictionary.com Unabridged

not-

variant of noto- before a vowel.
00:10
Not is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a scrap or morsel of food left at a meal.
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NOT

[not]
noun
a Boolean operator that returns a positive result if its operand is negative and a negative result if its operand is positive.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
not (nɒt) [Click for IPA pronunciation guide]
 
—adv
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 nā no + wiht creature, thing. See naught, nought]

not-
 
—combining form
a variant of noto-

noto- or (before a vowel) not-
 
—combining form
the back: notochord
 
[from Greek nōton the back]
 
not- or (before a vowel) not-
 
—combining form
 
[from Greek nōton the back]

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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Etymonline
Word Origin & History

not
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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FOLDOC
Computing Dictionary

NOT definition

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)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Idioms & Phrases

not

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
He had tinkered with it long enough to think it might not be totally unreliable.
The brine also attracts the delicate, not the bitter, flavors of smoldering wood chips.
Also weird is that while borrowing from one language to another is common, borrowing grammar is not nearly as common.
Also, make sure your leaves come from vines that have not been sprayed with pesticides.
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