The Collaborative International Dictionary of English v.0.48:
Australasian \Aus`tral*a"sian\, a. Of or pertaining to Australasia; as, Australasian regions. -- n. A native or an inhabitant of Australasia. [1913 Webster]WordNet (r) 3.0 (2006):
Australasian adj 1: relating to or found in Australasia