A country in Oceania. Official name: Commonwealth of Australia.

(Australia, historical) A short-lived colony (1846-1847) formed by combining what are now the regions of Queensland and the Northern Territory.

(chiefly Australia, UK) An order of chivalry established for the purpose of according recognition to Australian citizens and other persons for outstanding achievement.

(Australia, informal) An appointment made within the Order of Australia.

plural of Order of Australia

(medicine) Surface antigen of the hepatitis B virus (HBsAg).

plural of Australia antigen

A region in the Northern Territory of Australia, centred on Alice Springs.

One of the six states of Australia, occupying the western third of the content, with its capital at Perth. / (historical, till 1901) The British colony that is now the state of Western Australia.

One of the six states of Australia, located in the central southern part of the continent, with its capital at Adelaide.