Usually means: Structured explanations of observed phenomena.
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We found 18 dictionaries that define the word theories:

General (13 matching dictionaries)
  1. theories: Merriam-Webster
  2. theories: Oxford Learner's Dictionaries
  3. theories: Collins English Dictionary
  4. theories: Vocabulary.com
  5. Theories, theories: Wordnik
  6. theories: Cambridge Advanced Learner's Dictionary
  7. theories: Wiktionary
  8. theories: Dictionary.com
  9. Theories: Wikipedia, the Free Encyclopedia
  10. Theories: Online Plain Text English Dictionary
  11. Theories: AllWords.com Multi-Lingual Dictionary
  12. theories: FreeDictionary.org
  13. theories: TheFreeDictionary.com

Business (1 matching dictionary)
  1. theories: Legal dictionary

Computing (1 matching dictionary)
  1. theories: Encyclopedia

Medicine (2 matching dictionaries)
  1. theories: Merriam-Webster Medical Dictionary
  2. theories: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. theories: Idioms

(Note: See theory 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:  (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.
noun:  (informal) A hypothesis or conjecture.
▸ Also see theory


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