Etymology tree Proto-Italic *wre- Latin re-der. Old French re-bor. Middle English re- English re- Proto-Indo-European *ís? Proto-Indo-European *h₁óynos Proto-Italic *oinos Old Latin oinos Latin ūnus Proto-Indo-European *-yétider. Latin -iō Latin ūniō Proto-Indo-European *-tós Proto-Italic *-tos Latin -tus Latin ūnītuslbor. Middle English uniten English unite English reunite From re- + unite.