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We found 55 dictionaries with English definitions that include the word reason:
Click on the first link on a line below to go directly to a page where "reason" is defined.

General (37 matching dictionaries)

1. reason: Merriam-Webster.com [home, info]
2. reason: Oxford Dictionaries [home, info]
3. reason: American Heritage Dictionary of the English Language [home, info]
4. reason: Collins English Dictionary [home, info]
5. reason: Vocabulary.com [home, info]
6. reason, reason: Macmillan Dictionary [home, info]
7. Reason, reason, reason: Wordnik [home, info]
8. reason: Cambridge Advanced Learner's Dictionary [home, info]
9. Reason, reason: Wiktionary [home, info]
10. reason: Webster's New World College Dictionary, 4th Ed. [home, info]
11. reason: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. reason: Infoplease Dictionary [home, info]
13. reason: Dictionary.com [home, info]
14. reason (n.): Online Etymology Dictionary [home, info]
15. reason: UltraLingua English Dictionary [home, info]
16. reason: Cambridge Dictionary of American English [home, info]
17. reason: Cambridge International Dictionary of Idioms [home, info]
18. Reason (Asimov), Reason (EP), Reason (Melanie C album), Reason (Nami Tamaki song), Reason (No Angels song), Reason (Selah Sue album), Reason (Shaman album), Reason (argument), Reason (disambiguation), Reason (film), Reason (magazine), Reason (programming language), Reason (rapper), Reason (short story), Reason (software), Reason (song), Reason (syntax extension for OCaml), Reason (synthesizer), Reason (weapon system), Reason, The Reason (Beanie Sigel album), The Reason (Celine Dion song), The Reason (Diamond Rio album), The Reason (EP), The Reason (Hoobastank album), The Reason (Hoobastank song), The Reason (Lemar album), The Reason (Westlife song), The Reason (band), The Reason: Wikipedia, the Free Encyclopedia [home, info]
19. reason: Cambridge International Dictionary of Phrasal Verbs [home, info]
20. Reason: Online Plain Text English Dictionary [home, info]
21. reason: Webster's Revised Unabridged, 1913 Edition [home, info]
22. reason: Rhymezone [home, info]
23. reason: AllWords.com Multi-Lingual Dictionary [home, info]
24. reason: Webster's 1828 Dictionary [home, info]
25. Reason: E Cobham Brewer, The Reader's Handbook [home, info]
26. Reason: Dictionary of Phrase and Fable (1898) [home, info]
27. Reason: Encarta® Online Encyclopedia, North American Edition [home, info]
28. Reason: 1911 edition of the Encyclopedia Britannica [home, info]
29. reason: Free Dictionary [home, info]
30. reason: Hutchinson Dictionaries [home, info]
31. reason: Mnemonic Dictionary [home, info]
32. reason: WordNet 1.7 Vocabulary Helper [home, info]
33. Reason, reason: LookWAYup Translating Dictionary/Thesaurus [home, info]
34. reason: Dictionary/thesaurus [home, info]
35. reason: Wikimedia Commons US English Pronunciations [home, info]

Art (4 matching dictionaries)

36. reason: Dictionary of Philosophical Terms and Names [home, info]
37. reason: The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) [home, info]
38. reason: Literary Criticism [home, info]
39. reason-: A Cross Reference of Latin and Greek Elements [home, info]

Business (3 matching dictionaries)

40. reason: Glossary of Legal Terms [home, info]
41. REASON: Bouvier's Law Dictionary 1856 Edition [home, info]
42. Reason (logic), Reason (philosophy), reason: Legal dictionary [home, info]

Computing (1 matching dictionary)

43. Reason (logic), Reason (philosophy), reason: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

44. reason: online medical dictionary [home, info]
45. reason: Medical dictionary [home, info]

Miscellaneous (3 matching dictionaries)

46. REASON: Acronym Finder [home, info]
47. reason: Glosario de términos filosóficos (en inglés) [home, info]
48. reason: Idioms [home, info]

Religion (2 matching dictionaries)

49. Reason: Catholic Encyclopedia [home, info]
50. REASON: Irivng Hexham's Concise Dictionary of Religion [home, info]

Science (1 matching dictionary)

51. reason: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

52. The Reason, reason: Urban Dictionary [home, info]

Sports (1 matching dictionary)

53. Reason: 2060 Shadow-Slang [home, info]

(Note: See reasons for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (reason) ▸ noun:  the capacity for rational thought or inference or discrimination ("We are told that man is endowed with reason and capable of distinguishing good from evil") ▸ noun:  a fact that logically justifies some premise or conclusion ("There is reason to believe he is lying") ▸ noun:  an explanation of the cause of some phenomenon ("The reason a steady state was never reached was that the back pressure built up too slowly") ▸ noun:  a rational motive for a belief or action ("The reason that war was declared") ▸ noun:  a justification for something existing or happening ("They had good reason to rejoice") ▸ noun:  the state of having good sense and sound judgment ("He had to rely less on reason than on rousing their emotions") ▸ verb:  think logically ("The children must learn to reason") ▸ verb:  decide by reasoning; draw or come to a conclusion ("We reasoned that it was cheaper to rent than to buy a house") ▸ verb:  present reasons and arguments ▸ name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8996) ▸ Also see reasons ▸ Word origin ▸ Words similar to reason ▸ Usage examples for reason ▸ Popular adjectives describing reason ▸ Words that often appear near reason ▸ Rhymes of reason ▸ Invented words related to reason