From WordNet (r) 2.0 (August 2003) [wn]:
Australian
adj : of or relating to or characteristic of Australia or its
inhabitants; "Australian deserts"; "Australian
aborigines" [syn: Australian]
n 1: a native or inhabitant of Australia [syn: Australian,
Aussie]
2: the Austronesian languages spoken by Australian aborigines
[syn: Australian, Aboriginal Australian]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Australian \Aus*tra"li*an\, a. [From L. Terra Australis southern
land.]
Of or pertaining to Australia. -- n. A native or an
inhabitant of Australia.
[1913 Webster]