13th century, in the meaning defined above
Middle English, borrowed from Anglo-French, going back to Vulgar Latin *certās, feminine plural accusative (with adverbial value) of Latin certus "fixed, settled, indisputable" — more at certain entry 1
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Cite this Entry
“Certes.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/certes. Accessed 3 Mar. 2021.
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