47 mentions of "string theory" in an article about string theory does not constitute support for your implication that "theory" means unsubstantiated.
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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 2004 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>
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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 yet be verified as factual. <ref>For example, this 2004 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=] </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.