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1. What did the word " Australia" originally mean?

In the ancient times Greeks used the word Australia to mean south or the southern part of the world. Often known as Terra Australis Incognita, Australia has been referred to colloquially as Oz from the early 20th century. Legends of Terra Australis Incognita date back to Roman times and were commonplace in medieval geography, although not based on any documented knowledge of the continent.