What is the meaning of Theories?

(pl.) of Theory.
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APAWebster's. (2011). theories. Retrieved May 22, 2018, from http://smartdefine.org/theories/definitions/2071892
ChicagoWebster's. 2011. "theories" http://smartdefine.org/theories/definitions/2071892 (accessed May 22, 2018).
HarvardWebster's 2011, theories, Smart Define, viewed 22 May, 2018, <http://smartdefine.org/theories/definitions/2071892>.
MLAWebster's. "theories" 27 May 2011. Web. 22 May 2018. <http://smartdefine.org/theories/definitions/2071892>