Source : Webster's Revised Unabridged Dictionary (1913)

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.

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.

Source : WordNet®

southeast
     adj 1: coming from the southeast; "southeasterly breezes" [syn: {southeasterly}]
     2: situated in or oriented toward the southeast [syn: {southeastern},
         {southeasterly}]

southeast
     n 1: the compass point midway between south and east; at 135
          degrees [syn: {sou'-east}, {SE}]
     2: the southeastern region of the United States [syn: {southeastern
        United States}]

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