1. Of or relating to Australia or its peoples, languages, or cultures.
2. Ecology. Of, relating to, or being the zoogeographic region that includes Australia and the islands adjacent to it, including New Guinea, New Zealand, Polynesia, and Tasmania.

1. A native or inhabitant of Australia.
2. A member of any of the Aboriginal peoples of Australia.
3. Any of the languages of the Aboriginal peoples of Australia.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.