What is the meaning of Theories?

(pl.) of Theory.
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APAWebster's. (2011). theories. Retrieved August 16, 2017, from http://smartdefine.org/theories/definitions/2071892
ChicagoWebster's. 2011. "theories" http://smartdefine.org/theories/definitions/2071892 (accessed August 16, 2017).
HarvardWebster's 2011, theories, Smart Define, viewed 16 August, 2017, <http://smartdefine.org/theories/definitions/2071892>.
MLAWebster's. "theories" 27 May 2011. Web. 16 August 2017. <http://smartdefine.org/theories/definitions/2071892>