The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Southward \South"ward\, a.
   Toward the south.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Southward \South"ward\, n.
   The southern regions or countries; the south. --Sir W.
   Raleigh.
   [1913 Webster]

WordNet (r) 3.0 (2006):

southward
    adv 1: toward the south; "the ship turned southerly" [syn:
           southerly, southward, southwards]
    adj 1: moving toward the south; "a southbound train" [syn:
           southbound, southward]
    n 1: the cardinal compass point that is at 180 degrees [syn:
         south, due south, southward, S]