1855, in the meaning defined above
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From the Editors at Merriam-Webster
Words for That Certain Person
Specific behaviors and those who embody them
Cite this Entry
“Platitudinarian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/platitudinarian. Accessed 28 Jul. 2021.
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