ancestor UK /ˈæn.sɛs.tə/US /ˈæn.sɛs.tɚ/noun 5verb 1forms 3 noun5 •One from whom a person is descended, whether on the father's or mother's side, at any distance of time; a progenitor; a forefather; a forebear. •An earlier type; a progenitor.This fossil animal is regarded as the ancestor of the horse. •A word or phrase which serves as the origin of a term in another language. •(figurative) One who had the same role or function in former times.The Magpies are unbeaten and enjoying their best run since 1994, although few would have thought the class of 2011 would come close to emulating their ancestors. — 2011 •One from whom an estate has descended;—the correlative of heir. verb1 •To be an ancestor of.Her own grandfather had been a Virginian, a descendant of Pocahontas, of course, Pocahontas having been created by Divine Providence for the specific purpose of ancestoring Virginians. — 1920 formsancestored · ancestoring · ancestors