Usually means: Systematic explanation of phenomena observed.
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We found 55 dictionaries that define the word THEORY:

General (26 matching dictionaries)
  1. theory: Merriam-Webster.com
  2. theory: Oxford Learner's Dictionaries
  3. theory: American Heritage Dictionary of the English Language
  4. theory: Collins English Dictionary
  5. theory: Vocabulary.com
  6. Theory, theory: Wordnik
  7. theory: Cambridge Advanced Learner's Dictionary
  8. theory: Wiktionary
  9. theory: Webster's New World College Dictionary, 4th Ed.
  10. theory: The Wordsmyth English Dictionary-Thesaurus
  11. theory: Infoplease Dictionary
  12. theory: Dictionary.com
  13. theory: Online Etymology Dictionary
  14. theory: Cambridge Essential American English Dictionary
  15. Theory (brand), Theory (clothing retailer), Theory (disambiguation), Theory (mathematical logic), Theory (science), Theory: Wikipedia, the Free Encyclopedia
  16. Theory: Online Plain Text English Dictionary
  17. theory: Webster's Revised Unabridged, 1913 Edition
  18. theory: Rhymezone
  19. theory: AllWords.com Multi-Lingual Dictionary
  20. theory: Webster's 1828 Dictionary
  21. theory: Free Dictionary
  22. theory: Mnemonic Dictionary
  23. theory: Dictionary/thesaurus
  24. theory: Wikimedia Commons US English Pronunciations

Art (3 matching dictionaries)
  1. theory: ArtLex Lexicon of Visual Art Terminology
  2. The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) (No longer online)
  3. Literary Criticism (No longer online)

Business (2 matching dictionaries)
  1. theory: Legal dictionary
  2. BusinessDictionary.com (No longer online)

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

Medicine (3 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. theory: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. Sociology (No longer online)
  2. A Brief Critical Dictionary of Education (No longer online)
  3. theory: Idioms

Science (13 matching dictionaries)
  1. Misunderstood Physics Terms (No longer online)
  2. Archaeology Wordsmith (No longer online)
  3. Bird On! (No longer online)
  4. Theory: Eric Weisstein's World of Mathematics
  5. Theory: Eric Weisstein's World of Physics
  6. - - Theory, Theory: Extragalactic Astronomy
  7. General Chemistry Online (No longer online)
  8. theory: Evolution Glossary
  9. theory, theory, theory: PlanetMath Encyclopedia
  10. Theory: Physic and Astronomy Glossary
  11. theory: Anthropological Terms
  12. Anthropology dictionary (No longer online)
  13. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. Theory: Urban Dictionary

Tech (1 matching dictionary)
  1. theory: Webster's New World Telecom Dictionary

(Note: See theories as well.)

Definitions from Wiktionary (theory)

noun:  A description of an event or system that is considered to be accurate.
noun:  (sciences) A coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc.
noun:  (uncountable) The underlying principles or methods of a given technical skill, art etc., as opposed to its practice.
noun:  (mathematics) A field of study attempting to exhaustively describe a particular class of constructs.
noun:  A hypothesis or conjecture.
noun:  (countable, logic) A set of axioms together with all statements derivable from them; or, a set of statements which are deductively closed. Equivalently, a formal language plus a set of axioms (from which can then be derived theorems). The statements may be required to all be bound (i.e., to have no free variables).
noun:  (obsolete) Mental conception; reflection, consideration.

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    crimson,     indigo,     teal,     cyan,     magenta, more...



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