nots

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.
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World English Dictionary
not (nɒt)
 
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 no + wiht creature, thing. See naught, nought]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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