Main entry: ancestor, antecedent, ascendant, ascendent, root
Definition: someone from whom you are descended (but usually more remote than a grandparent)
Antonyms: descendant, descendent
Definition: a person considered as descended from some ancestor or race
Main entry: antecedent
Definition: preceding in time or order
Antonyms: subsequent
Definition: following in time or order
Antonyms: posterior
Definition: located at or near or behind a part or near the end of a structure