(comparative more groundbreakingly, superlative most groundbreakingly)
groundbreaking + -ly
"groundbreakingly." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/groundbreakingly>.
groundbreakingly. (n.d.). Retrieved October 15th, 2018, from http://www.yourdictionary.com/groundbreakingly
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