1.NounA person who gave or supposedly gave their name to a people, place, institution, etc."The Greeks and Romans tended to credit nearly every location and ethnicity to a legendary eponym, Hellas to Hellen, Rome to Romulus, Egypt to Aegyptus, etc.; Similar to the Greek eponymous archons and Roman consuls, the names of the annually appointed Assyrian limus were used for their years in office and they are accordingly also known as eponyms."