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We found 62 dictionaries with English definitions that include the word not:
Click on the first link on a line below to go directly to a page where "not" is defined.

General (36 matching dictionaries)

1. NOT, not: Merriam-Webster.com [home, info]
2. not: Oxford Learner's Dictionaries [home, info]
3. NOT, not: American Heritage Dictionary of the English Language [home, info]
4. not, not-: Collins English Dictionary [home, info]
5. not: Vocabulary.com [home, info]
6. not: Macmillan Dictionary [home, info]
7. NOt, Not, Not, not, not, not, not, not, not, not, not: Wordnik [home, info]
8. not: Cambridge Advanced Learner's Dictionary [home, info]
9. NOT, Not, not: Wiktionary [home, info]
10. not, not-: Webster's New World College Dictionary, 4th Ed. [home, info]
11. not: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. not: Infoplease Dictionary [home, info]
13. Not, not: Dictionary.com [home, info]
14. not: Online Etymology Dictionary [home, info]
15. not: UltraLingua English Dictionary [home, info]
16. not: Cambridge Dictionary of American English [home, info]
17. not: Cambridge International Dictionary of Idioms [home, info]
18. NOT, ... Not, Not (song), Not: Wikipedia, the Free Encyclopedia [home, info]
19. not: Cambridge International Dictionary of Phrasal Verbs [home, info]
20. Not: Online Plain Text English Dictionary [home, info]
21. not: Webster's Revised Unabridged, 1913 Edition [home, info]
22. not: Rhymezone [home, info]
23. Not (f), not: AllWords.com Multi-Lingual Dictionary [home, info]
24. not: Webster's 1828 Dictionary [home, info]
25. not: All About Homonyms [home, info]
26. not: Free Dictionary [home, info]
27. not: Hutchinson Dictionaries [home, info]
28. not: Mnemonic Dictionary [home, info]
29. not: WordNet 1.7 Vocabulary Helper [home, info]
30. not: LookWAYup Translating Dictionary/Thesaurus [home, info]
31. NOT, not-: Dictionary/thesaurus [home, info]
32. not: Wikimedia Commons US English Pronunciations [home, info]
33. not-: Dictionary.com [home, info]
34. Not: Wordnik [home, info]

Art (3 matching dictionaries)

35. not: Technical Glossary of Theatre Terms [home, info]
36. not-: A Cross Reference of Latin and Greek Elements [home, info]
37. NOT: ODLIS: Online Dictionary of Library and Information Science [home, info]

Business (2 matching dictionaries)

38. Not (logic), not: Legal dictionary [home, info]
39. not: Financial dictionary [home, info]

Computing (5 matching dictionaries)

40. NOT: Free On-line Dictionary of Computing [home, info]
41. NOT: CCI Computer [home, info]
42. NOT: Computer Telephony & Electronics Dictionary and Glossary [home, info]
43. not: Dictionary of Algorithms and Data Structures [home, info]
44. NOT, Not (logic): Encyclopedia [home, info]

Medicine (5 matching dictionaries)

45. not: Sound Alike Words [home, info]
46. NOT: online medical dictionary [home, info]
47. not: DICTIONARY OF TERMS IN ORAL PHYSIOLOGY [home, info]
48. NOT: Skin Cancer Information [home, info]
49. Not (logic), not, not(o)-: Medical dictionary [home, info]

Miscellaneous (6 matching dictionaries)

50. NOT: Navajo Code Talkers' Dictionary [home, info]
51. not: Encyclopedia of Graphic Symbols [home, info]
52. not, not, not: Terminology and Descriptions of Geneaological Words [home, info]
53. NOT: Acronym Finder [home, info]
54. NOT: Three Letter Words with definitions [home, info]
55. NOT: AbbreviationZ [home, info]

Science (4 matching dictionaries)

56. not: Misunderstood Physics Terms [home, info]
57. NOT, Not: Eric Weisstein's World of Mathematics [home, info]
58. not-: Glossary of Roots of Botanical Names [home, info]
59. NOT: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

60. N.O.T: Urban Dictionary [home, info]

(Note: See nots for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (not) ▸ adverb:  negation of a word or group of words ("He does not speak French") ▸ Also see nots ▸ Word origin ▸ Words similar to not ▸ Usage examples for not ▸ Idioms related to not (New!) ▸ Words that often appear near not ▸ Rhymes of not ▸ Invented words related to not