- a real or mythical person from whose name the name of a nation, institution, etc. is derived: Sir William Penn, father of William Penn, is the eponym of Pennsylvania
- a person whose name has become identified with some period, movement, theory, etc.
- a noun or name derived from a person's name (Ex.: Jacksonville after Andrew Jackson; seaborgium after Glenn T. Seaborg; Lou Gehrig's disease)
Origin of eponymfrom Classical Greek ep?nymos, eponymous from epi-, upon + onyma, name