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We found 58 dictionaries with English definitions that include the word theory:
Click on the first link on a line below to go directly to a page where "theory" is defined.

General dictionaries General (30 matching dictionaries)
  1. theory: Oxford Dictionaries [home, info]
  2. theory: American Heritage Dictionary of the English Language [home, info]
  3. theory: Collins English Dictionary [home, info]
  4. theory: Vocabulary.com [home, info]
  5. theory: Macmillan Dictionary [home, info]
  6. theory: Merriam-Webster's Online Dictionary, 11th Edition [home, info]
  7. Theory, theory: Wordnik [home, info]
  8. theory: Cambridge Advanced Learner's Dictionary [home, info]
  9. Theory: Wiktionary [home, info]
  10. theory: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. theory: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. theory: Infoplease Dictionary [home, info]
  13. theory: Dictionary.com [home, info]
  14. theory: Online Etymology Dictionary [home, info]
  15. theory: UltraLingua English Dictionary [home, info]
  16. theory: Cambridge Dictionary of American English [home, info]
  17. Theory (brand), Theory (chess), Theory (logic), Theory (mathematics), Theory (model theory), Theory (poem), Theory (restaurant), Theory (science), Theory: Wikipedia, the Free Encyclopedia [home, info]
  18. Theory: Online Plain Text English Dictionary [home, info]
  19. theory: Webster's Revised Unabridged, 1913 Edition [home, info]
  20. theory: Rhymezone [home, info]
  21. theory: AllWords.com Multi-Lingual Dictionary [home, info]
  22. theory: Webster's 1828 Dictionary [home, info]
  23. theory: Free Dictionary [home, info]
  24. theory: Mnemonic Dictionary [home, info]
  25. theory: WordNet 1.7 Vocabulary Helper [home, info]
  26. theory: LookWAYup Translating Dictionary/Thesaurus [home, info]
  27. theory: Dictionary/thesaurus [home, info]
  28. theory: Wikimedia Commons US English Pronunciations [home, info]

Art dictionaries Art (3 matching dictionaries)
  1. theory: ArtLex Lexicon of Visual Art Terminology [home, info]
  2. theory: The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) [home, info]
  3. theory: Literary Criticism [home, info]

Business dictionaries Business (2 matching dictionaries)
  1. theory: Legal dictionary [home, info]
  2. theory: BusinessDictionary.com [home, info]

Computing dictionaries Computing (3 matching dictionaries)
  1. theory: Free On-line Dictionary of Computing [home, info]
  2. Theory: Cybernetics and Systems [home, info]
  3. Theory (mathematical logic), theory: Encyclopedia [home, info]

Medicine dictionaries Medicine (2 matching dictionaries)
  1. theory: online medical dictionary [home, info]
  2. theory: Medical dictionary [home, info]

Miscellaneous dictionaries Miscellaneous (3 matching dictionaries)
  1. theory: Sociology [home, info]
  2. theory: A Brief Critical Dictionary of Education [home, info]
  3. theory: Idioms [home, info]

Science dictionaries Science (13 matching dictionaries)
  1. Theory: Misunderstood Physics Terms [home, info]
  2. theory: Archaeology Wordsmith [home, info]
  3. Theory: Bird On! [home, info]
  4. Theory: Eric Weisstein's World of Mathematics [home, info]
  5. Theory: Eric Weisstein's World of Physics [home, info]
  6. - - Theory, Theory: Extragalactic Astronomy [home, info]
  7. theory: General Chemistry Online [home, info]
  8. theory: Evolution Glossary [home, info]
  9. theory, theory, theory: PlanetMath Encyclopedia [home, info]
  10. Theory: Physic and Astronomy Glossary [home, info]
  11. theory: Anthropological Terms [home, info]
  12. theory: Anthropology dictionary [home, info]
  13. theory: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. Theory: Urban Dictionary [home, info]

Tech dictionaries Tech (1 matching dictionary)
  1. theory: Webster's New World Telecom Dictionary [home, info]

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (theory)

noun:  a belief that can guide behavior ("The architect has a theory that more is less")
noun:  a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena ("True in fact and theory")
noun:  a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena ("A scientific hypothesis that survives experimental testing becomes a scientific theory")

Word origin

Phrases that include theory:   kinetic theory, theory of games, economic theory, undulatory theory, dow theory, more...

Words similar to theory:   hypothesis, possibility, theories, ism, more...

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