Meaning

verb act in concert or unite in a common purpose or belief

verb become one

verb have or possess in combination

originEtymology tree 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 -ed English united From unite + -ed.

Etymology from Wiktionary, CC BY-SA 3.0