certes

adverb

cer·​tes ˈsər-tēz  ˈsərts 

archaic

: in truth : certainly

Word History

Etymology

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

First Known Use

13th century, in the meaning defined above