Usually means: Justification for actions, beliefs, or thoughts.
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We found 45 dictionaries that define the word reason:

General (28 matching dictionaries)
  1. reason: Merriam-Webster.com
  2. reason: Oxford Learner's Dictionaries
  3. reason: American Heritage Dictionary of the English Language
  4. reason: Collins English Dictionary
  5. reason: Vocabulary.com
  6. Reason, reason, reason: Wordnik
  7. reason: Cambridge Advanced Learner's Dictionary
  8. Reason, reason: Wiktionary
  9. reason: Webster's New World College Dictionary, 4th Ed.
  10. reason: The Wordsmyth English Dictionary-Thesaurus
  11. reason: Infoplease Dictionary
  12. reason: Dictionary.com
  13. reason (n.): Online Etymology Dictionary
  14. reason: Cambridge Essential American English Dictionary
  15. 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
  16. Reason: Online Plain Text English Dictionary
  17. reason: Webster's Revised Unabridged, 1913 Edition
  18. reason: Rhymezone
  19. reason: AllWords.com Multi-Lingual Dictionary
  20. reason: Webster's 1828 Dictionary
  21. Reason: E Cobham Brewer, The Reader's Handbook
  22. Reason: Dictionary of Phrase and Fable (1898)
  23. reason: Free Dictionary
  24. reason: Mnemonic Dictionary
  25. reason: Dictionary/thesaurus
  26. reason: Wikimedia Commons US English Pronunciations

Art (3 matching dictionaries)
  1. The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) (No longer online)
  2. Literary Criticism (No longer online)
  3. reason-: A Cross Reference of Latin and Greek Elements

Business (3 matching dictionaries)
  1. Glossary of Legal Terms (No longer online)
  2. Bouvier's Law Dictionary 1856 Edition (No longer online)
  3. Reason (logic), Reason (philosophy), reason: Legal dictionary

Computing (1 matching dictionary)
  1. Reason (logic), Reason (philosophy), reason: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. reason: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. REASON: Acronym Finder
  2. reason: Glosario de términos filosóficos (en inglés)
  3. reason: Idioms

Religion (2 matching dictionaries)
  1. Reason: Catholic Encyclopedia
  2. Irivng Hexham's Concise Dictionary of Religion (No longer online)

Science (1 matching dictionary)
  1. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. The Reason, reason: Urban Dictionary

Sports (1 matching dictionary)
  1. 2060 Shadow-Slang (No longer online)

(Note: See reasoned as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A cause:
noun:  That which causes something: an efficient cause, a proximate cause.
noun:  A motive for an action or a determination.
noun:  An excuse: a thought or a consideration offered in support of a determination or an opinion; that which is offered or accepted as an explanation.
noun:  (logic) A premise placed after its conclusion.
noun:  (uncountable) Rational thinking (or the capacity for it); the cognitive faculties, collectively, of conception, judgment, deduction and intuition.
noun:  (obsolete) Something reasonable, in accordance with thought; justice.
noun:  (mathematics, obsolete) Ratio; proportion.
verb:  (intransitive) To deduce or come to a conclusion by being rational
verb:  (intransitive) To perform a process of deduction or of induction, in order to convince or to confute; to argue.
verb:  (intransitive, obsolete) To converse; to compare opinions.
verb:  (transitive, intransitive) To arrange and present the reasons for or against; to examine or discuss by arguments; to debate or discuss.
verb:  (transitive, rare) To support with reasons, as a request.
verb:  (transitive) To persuade by reasoning or argument.
verb:  (transitive, with down) To overcome or conquer by adducing reasons.
verb:  (transitive, usually with out) To find by logical process; to explain or justify by reason or argument.
noun:  A wall plate.
noun:  A surname.

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