Where does “milliare” come from?

milliare (Latin) comes from Latin milliārius, from Latin Mīlle, from Proto-Italic smīɣeslī, from Proto-Indo-European smih₂ǵʰéslih₂.

Ancestry of “milliare”, step by step

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

milliare — Etymology, Origin & Word History | Etymology Explorer