Source : Webster's Revised Unabridged Dictionary (1913)

Southward \South"ward\ (?; colloq. ?), Southwards \South"wards\
   (?; colloq. ?), adv.
   Toward the south, or toward a point nearer the south than the
   east or west point; as, to go southward.

Southward \South"ward\, a.
   Toward the south.

Southward \South"ward\, n.
   The southern regions or countries; the south. --Sir W.
   Raleigh.

Source : WordNet®

southward
     adj : moving toward the south; "a southbound train" [syn: {southbound}]
     adv : toward the south [syn: {southwards}]