Nouns

(n)ascendant, ascendentposition or state of being dominant or in control“that idea was in the ascendant”
(n)ancestor, ascendant, ascendent, antecedent, rootsomeone from whom you are descended (but usually more remote than a grandparent)

Adjectives

(s)ascendant, ascendent, ascensivetending or directed upward“rooted and ascendant strength like that of foliage” (John Ruskin)
(s)ascendant, ascendent, dominatingmost powerful or important or influential“the economically ascendant class”, “D-day is considered the dominating event of the war in Europe”