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A theory is an abstract or systematic explanation of some phenomenon or subject matter. {{fact}} It is more substantial than a conjecture or hypothesis, but may not be verified as factual. {{fact}}

A theory is an abstract or systematic explanation of some phenomenon or subject matter. It is more substantial than a conjecture or hypothesis, but may not be verified as factual. <ref>For example, this 2994 NY Times article on string theory [[http://www.nytimes.com/2004/12/07/science/07stri.html?ei=5090&en=fd15a74e2dca3af0&ex=1260075600&partner=rssuserland&pagewanted=all&position=]] uses the word "theory" 70 times in this sense.</ref>

The term theory is often used outside of science, such as in music theory, number theory, or Marxist theory.

The term theory is often used outside of science, such as in music theory, number theory, or Marxist theory.