ascendancy

Supremacy; dominant control; the quality of being in the ascendant.

(historical, Ireland, sometimes capitalized) A class of Protestant landowners and professionals that dominated political and social life in Ireland up to the early 20th century

(ecology) A quantitative attribute of an ecosystem, defined as a function of the ecosystem's trophic network, and intended to indicate its ability to prevail against disturbance by virtue of its combined organization and size.