prepotence (noun) ascendancy/ascendency: domination
Sinonime: all at once, all together, as one, at one fell swoop, closely, coincidentally, collectively, combined, commonly, concertedly, concomitantly, concurrently, conjointly, contemporaneously, en masse, hand in glove, hand in hand, in a body, in concert, in cooperation, in one breath, in sync, in unison, jointly, mutually, on the beat, side by side, simultaneously, synchronically, unanimously, unitedly, with one accord, with one voice, with the beat
Antonime: decline, inferiority, powerlessness, subordination