The Collaborative International Dictionary of English v.0.48:

Southeast \South`east"\ (?; by sailors sou"-), n.
   The point of the compass equally distant from the south and
   the east; the southeast part or region.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Southeast \South`east\ (?; by sailors sou"-), a.
   Of or pertaining to the southeast; proceeding toward, or
   coming from, the southeast; as, a southeast course; a
   southeast wind.
   [1913 Webster]

WordNet (r) 3.0 (2006):

south-east
    adv 1: to, toward, or in the southeast [syn: southeast,
           south-east, sou'-east]