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Australasia

1766 in geography, from French Australasie (De Brosses, 1756), "Australia and neighboring islands," also used later in zoology in a somewhat different sense (with reference to Wallace's line); see Australia + Asia. Related: Australasian.

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Definitions of Australasia from WordNet

Australasia (n.)
Australia, New Zealand, and neighboring islands in the South Pacific;
From wordnet.princeton.edu