In formal English, the term plenitude, or simply plenty is preferred.
From plentiful + -ness
"plentifulness." YourDictionary, n.d. Web. 14 September 2018. <http://www.yourdictionary.com/plentifulness>.
plentifulness. (n.d.). Retrieved September 14th, 2018, from http://www.yourdictionary.com/plentifulness
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