Where does “avec” come from?

avec (French) comes from Middle French avec, from Old French avoc, from Vulgar Latin aboc, from Latin apud, from Latin ad post.

avec (French): with

Definitions

Step	Language	Word	Meaning
1	Middle French	avec	Alternative form of avecques
2	Old French	avoc	—
3	Vulgar Latin	aboc	—
4	Latin	apud	at, by, near, among; before, in the presence of,...
5	Latin	ad post	—

avec — Etymology, Origin & Word History | Etymology Explorer