French, literally "before," in various terms borrowed into English; cognate with Italian avanti, both from Late Latin abante, a compound of ab "from" (see ab-) and ante "before, in front of" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") which meant "from in front of," but in Vulgar Latin came to mean simply "before."
<a href="https://www.etymonline.com/word/avaunt">Etymology of avaunt by etymonline</a>
Harper, D. (n.d.). Etymology of avaunt. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/avaunt