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