noun The quality of being in the ascendant; dominant control, supremacy.
noun Ellipsis of Protestant Ascendancy, a class of Protestant landowners and professionals that dominated political and social life in Ireland up to the early 20th century.
noun 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. .mw-parser-output .defdate{font-size:smaller}