east·ern / ˈēstərn/ • adj. 1. situated in the east, or directed toward or facing the east: the eastern slopes of the mountain. ∎  (of a wind) blowing from the east.2. (usu. Eastern) living in or originating from the east, in particular the regions or countries lying to the east of Europe: an Eastern mystic.DERIVATIVES: east·ern·most / ˈēstərnˌmōst/ adj.

eastern Eastern Church another name for the Orthodox Church.
Eastern Empire the eastern part of the Roman Empire, after its division in ad 395.