n. The direction or point on the mariner's compass halfway between due south and due east, or 135° east of due north.n. An area or region lying in the southeast.n. A region of the southeast United States generally including Alabama, Georgia, South Carolina, and Florida.adj. To, toward, of, facing, or in the southeast.adj. Originating in or coming from the southeast: a southeast wind. ad. In, from, or toward the southeast.