What is the meaning of rigourousness?

noun

11
 
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APAWordNet. (2010). rigourousness. Retrieved July 20, 2018, from http://smartdefine.org/rigourousness/definitions/1306978
ChicagoWordNet. 2010. "rigourousness" http://smartdefine.org/rigourousness/definitions/1306978 (accessed July 20, 2018).
HarvardWordNet 2010, rigourousness, Smart Define, viewed 20 July, 2018, <http://smartdefine.org/rigourousness/definitions/1306978>.
MLAWordNet. "rigourousness" 23 October 2010. Web. 20 July 2018. <http://smartdefine.org/rigourousness/definitions/1306978>