concomitant (adj.)

"accompanying, conjoined with, concurrent, going together," c. 1600, from French concomitant, from Late Latin concomitantem (nominative concomitans), present participle of concomitari "accompany, attend," from assimilated form of com "with, together" (see con-) + comitari "join as a companion," from comes (genitive comitis) "companion," "companion, attendant," the Roman term for a provincial governor, from com "with" (see com-) + stem of ire "to go" (from PIE root *ei- "to go"). Related: Concomitantly; concomitance (1530s).