Where does “millésime” come from?

millésime (French) comes from Latin millesimus, from Latin Mīlle, from Proto-Italic smīɣeslī, from Proto-Indo-European smih₂ǵʰéslih₂.

millésime (French): year, date; vintage

Definitions

Step	Language	Word	Meaning
1	Latin	millesimus	thousandth
2	Latin	Mīlle	—
3	Proto-Italic	smīɣeslī	—
4	Proto-Indo-European	smih₂ǵʰéslih₂	—

millésime — Etymology, Origin & Word History | Etymology Explorer