MediaPronunciation: /ˈmiːdɪə/Definition of Media an ancient region of Asia to the south-west of the Caspian Sea, corresponding approximately to present-day Azerbaijan, NW Iran, and NE Iraq. Originally inhabited by the Medes, the region was conquered in 550 bc by Cyrus the Great of Persia. Derivatives Median adjective Media in other Oxford dictionaries Definition of Media in the US English dictionary