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NOT (nŏt)
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n.
A logical operator that returns a false value if the operand is true and a true value if the operand is false.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
not (nŏt)
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adv.
In no way; to no degree. Used to express negation, denial, refusal, or prohibition: I will not go. You may not have any.

[Middle English, alteration of naught, nought; see NAUGHT.]

Usage Note: The positioning of not and other negatives in a sentence is important to avoid ambiguity. The sentence All classes are not open to enrollment could be taken to mean either "All classes are closed to enrollment" or "Not all classes are open to enrollment." Similarly, the sentence Kim didn't sleep until noon could mean either "Kim went to sleep at noon" or "Kim got up before noon." · Not only and but also are usually classified as correlative conjunctions. They add emphasis to each part of the construction and suggest that the second part is particularly unexpected or surprising. As with both ... and and other correlatives, parallelism requires that each conjunction be followed by a construction of the same grammatical type. Thus, She not only bought a new car but also a new lawnmower displays faulty parallelism, where She bought not only a new car but also a new lawnmower does not, because both not only and but also are followed by noun phrases. See Usage Note at only.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.