adjective/sɛʁ.tɛ̃/
certain, guaranteed (sure, positive); certain (specified, particular); certain (of indefinite, unknown or simply unmentioned identity, quality or quantity) (prepositive to the noun it modifies, and usually preceded by an indefinite article)
“sûr et certain”
Etymology tree Proto-Indo-European *krey- Proto-Italic *kritos Latin certus Proto-Indo-European *-nós Proto-Italic *-nos Latin -nus Latin -ānus Latin *certānus Old French certain French certain Inherited from Old French certain, from Vulgar Latin unattested form *certānus, extended form of Latin certus (“fixed, resolved, certain”).