An Etymological Dictionary of Astronomy and Astrophysics

A prefix meaning “again, anew” to indicate repetition (as rebuild, retell), “back, backward” to indicate “withdrawal” or “backward motion” (react, recall),
or sometimes merely intensive (refine, resolve).

Etymology (EN): M.E., from O.Fr., from and L. re- “again, back.”

Etymology (PE): Vâ-, variant bâz-, prefix denoting “reversal, opposition; separation; repetition; open; off; away,” from Mid.Pers. abâz-, apâc-; O.Pers. apa- [pref.] “away, from;”
Av. apa- [pref.] “away, from,”
apaš [adv.] “toward the back;” cf. Skt. ápāñc “situated behind.”