n. islands of the central and southern Pacific Ocean (including Polynesia, Micronesia, Melanesia, Australia and New Zealand)

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Noun
1. a large group of islands in the south Pacific including Melanesia and Micronesia and Polynesia (and sometimes Australasia and the Malay Archipelago)
(synonym) Oceanica
(hypernym) archipelago
(part-holonym) Pacific, Pacific Ocean
(part-meronym) Melanesia

nf. Oceania, islands of the central and southern Pacific Ocean

(n.) = Oceania.
Ex: A considerable amount of archival material relating to Africa, Asia and Oceania has been created by the various activities of Austrian diplomats, merchants and pilgrims since the early modern period.