with certainty; truly
WordReference Random House Unabridged Dictionary of American English © 2025
cer•tes
(sûr′tēz),USA pronunciation adv. [Archaic.]
- certainly;
in truth.
- Latin *ā certīs, literally, from sure (things); see a-4, certain
- Old French phrase a certes
- Middle English 1200–50
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