Where does “avuec” come from?

avuec (Old French) comes from Latin apud, from Latin ad post.

avuec (Old French): Alternative form of avoec; with

Definitions

Step	Language	Word	Meaning
1	Latin	apud	at, by, near, among; before, in the presence of,...
2	Latin	ad post	—

avuec — Etymology, Origin & Word History | Etymology Explorer