Persia n 1: an empire in southern Asia created by Cyrus the Great in the 6th century BC and destroyed by Alexander the Great in the 4th century BC [syn: {Persian Empire}] 2: a theocratic islamic republic in the Middle East in western Asia; Iran was the core of the ancient empire that was known as Persia until 1935; rich in oil; involved in state-sponsored terrorism [syn: {Iran}, {Islamic Republic of Iran}]