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Latin ridiculosus + English -ity
From the Editors at Merriam-Webster
6 Filthy Americanisms that Aren't...
And one that is
Cite this Entry
“Ridiculosity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ridiculosity. Accessed 7 Jul. 2022.
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