Usually means: Negates the truth of statements.
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We found 52 dictionaries that define the word not:

General (28 matching dictionaries)
  1. NOT, not: Merriam-Webster.com
  2. not: Oxford Learner's Dictionaries
  3. NOT, not: American Heritage Dictionary of the English Language
  4. not, not-: Collins English Dictionary
  5. not: Vocabulary.com
  6. NOt, Not, Not, not, not, not, not, not, not, not, not: Wordnik
  7. not: Cambridge Advanced Learner's Dictionary
  8. NOT, Not, not: Wiktionary
  9. not, not-: Webster's New World College Dictionary, 4th Ed.
  10. not: The Wordsmyth English Dictionary-Thesaurus
  11. not: Infoplease Dictionary
  12. Not, not: Dictionary.com
  13. not: Online Etymology Dictionary
  14. not: Cambridge Essential American English Dictionary
  15. NOT, ... Not, Not (song), Not: Wikipedia, the Free Encyclopedia
  16. Not: Online Plain Text English Dictionary
  17. not: Webster's Revised Unabridged, 1913 Edition
  18. not: Rhymezone
  19. Not (f), not: AllWords.com Multi-Lingual Dictionary
  20. not: Webster's 1828 Dictionary
  21. not: Free Dictionary
  22. not: Mnemonic Dictionary
  23. NOT, not-: Dictionary/thesaurus
  24. not: Wikimedia Commons US English Pronunciations
  25. not-: Dictionary.com
  26. Not: Wordnik

Art (2 matching dictionaries)
  1. Technical Glossary of Theatre Terms (No longer online)
  2. not-: A Cross Reference of Latin and Greek Elements

Business (2 matching dictionaries)
  1. Not (logic), not: Legal dictionary
  2. not: Financial dictionary

Computing (4 matching dictionaries)
  1. NOT: Free On-line Dictionary of Computing
  2. NOT: CCI Computer
  3. not: Dictionary of Algorithms and Data Structures
  4. NOT, Not (logic): Encyclopedia

Medicine (5 matching dictionaries)
  1. not: Sound Alike Words
  2. online medical dictionary (No longer online)
  3. DICTIONARY OF TERMS IN ORAL PHYSIOLOGY (No longer online)
  4. Skin Cancer Information (No longer online)
  5. Not (logic), not, not(o)-: Medical dictionary

Miscellaneous (6 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. Encyclopedia of Graphic Symbols (No longer online)
  3. not, not, not: Terminology and Descriptions of Geneaological Words
  4. NOT: Acronym Finder
  5. NOT: Three Letter Words with definitions
  6. AbbreviationZ (No longer online)

Science (4 matching dictionaries)
  1. Misunderstood Physics Terms (No longer online)
  2. NOT, Not: Eric Weisstein's World of Mathematics
  3. Glossary of Roots of Botanical Names (No longer online)
  4. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. N.O.T: Urban Dictionary

(Note: See noting as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adverb:  Negates the meaning of the modified verb.
adverb:  To no degree.
adverb:  (litotes) Used to indicate the opposite or near opposite, often in a form of understatement.
adverb:  Used before a determiner phrase, a pronominal phrase etc. to convey a negative attitude (e.g. denial, sadness, anger) towards something.
adverb:  (ironic, informal, originally African-American Vernacular) Used before a non-finite clause (especially a gerund-participial clause) or less commonly a determiner phrase to ironically convey some attitude (e.g. surprise, incredulity, amusement, embarrassment) towards something.
noun:  An instance of using the word “not”; a negation or denial.
noun:  (mathematics, logic) A unary operation on logical values that changes true to false, and false to true.
noun:  Alternative letter-case form of NOT (“unary operation on logical values that changes true to false, and false to true”). [(mathematics, logic) A unary operation on logical values that changes true to false, and false to true.]
noun:  (Egyptian mythology) Alternative spelling of Nut. [(Egyptian mythology) The goddess who serves as the personification of the sky.]

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