(a.) Dominant; most prevalent; outweighing; overbalancing\; -- used literally and figuratively; as, a preponderant weight; of preponderant importance.

arch ascendant at the head banner boss capital cardinal central champion chief commanding controlling crowning dominant first focal foremost general governing great head headmost hegemonic hegemonistic in ascendancy in charge in chief in the ascendant leading magisterial main master on the throne overbearing overruling paramount predominant predominate preeminent prepollent preponderate prepotent prevailing prevalent primal primary prime principal ranking regnant regulating regulative regulatory reigning ruling sovereign star stellar supereminent supreme swaying topflight