Aus·tral·ian / ôˈstrālyən/ • n. a native or national of Australia, or a person of Australian descent.• adj. of or relating to Australia. ∎  Zool. of, relating to, or denoting a zoogeographical region comprising Australasia together with Indonesia east of Wallace's line, in which monotremes and marsupials dominate the fauna. Compare with Notogaea, oriental. ∎  Bot. of, relating to, or denoting a phytogeographical kingdom comprising only Australia and Tasmania.DERIVATIVES: Aus·tral·ian·ism / -ˌnizəm/ n.

AUSTRALIAN.
1. Australian English: ‘English and French spoken; Australian understood’ ( O. Hogue, Trooper Bluegum at the Dardanelles, 1916).

2. Australian bad language: ‘Then he began to speak some pure Australian, and the language that came out of the hole in that driver's face heated the air for yards around’ (Honk, France, 1915).