From zeroth + -ly, on the model of firstly, secondly, and so on.
"zerothly." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/zerothly>.
zerothly. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/zerothly
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