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WordNet (r) 3.0 (2006) (WordNet)

Australia
n 1: a nation occupying the whole of the Australian continent;
Aboriginal tribes are thought to have migrated from
southeastern Asia 20,000 years ago; first Europeans were
British convicts sent there as a penal colony [synonym:
{Australia}, {Commonwealth of Australia}]
2: the smallest continent; between the South Pacific and the
Indian Ocean