1. adverb /nɒt,nɑt/
a) Negates the meaning of the modified verb.
Well, Im not a crook. Ive earned everything Ive got.
b) To no degree
Did you take out the trash? No, I did not.
See Also: aint, arent, cant, cannot, darent, doesnt, dont, didnt, forget-me-not, hadnt, hasnt, have-not, havent, isnt, mightnt, neednt, neither, no, nor, not bad, not guilty, not quite, not think, notwithstanding, shant, shouldnt, wasnt, wont, wouldnt
2. conjunction /nɒt,nɑt/
And not.
I wanted a plate of shrimp, not a bucket of chicken.
3. interjection /nɒt,nɑt/
Used to indicate that the previous phrase was meant sarcastically or ironically.
I really like hanging out with my little brother watching Barney... not!
Syn: I dont think
4. noun /nɒt,nɑt/
Unary logical function NOT, true if input is false, or a gate implementing that negation function.
You need a not there to conform with the negative logic of the memory chip.
See Also: NOR
Wikipedia foundation.