What is the meaning of costless?

adjective

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APAWordNet. (2010). costless. Retrieved January 16, 2019, from http://smartdefine.org/costless/definitions/1171524
ChicagoWordNet. 2010. "costless" http://smartdefine.org/costless/definitions/1171524 (accessed January 16, 2019).
HarvardWordNet 2010, costless, Smart Define, viewed 16 January, 2019, <http://smartdefine.org/costless/definitions/1171524>.
MLAWordNet. "costless" 23 October 2010. Web. 16 January 2019. <http://smartdefine.org/costless/definitions/1171524>
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