Definitions
1.nounOne from whom a person is descended, whether on the father's or mother's side, at any distance of time; a progenitor; a forefather.
2.nounAn earlier type; a progenitor"This fossil animal is regarded as the ancestor of the horse."
3.nounOne from whom an estate has descended;—the correlative of heir.
4.nounOne who had the same role or function in former times.
5.nounA word or phrase which serves as the origin of a term in another language.
6.verbTo be an ancestor of.