Oceania

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

Oceania (sometimes Oceanica) is a geographical, often geopolitical, region consisting of numerous lands—mostly  islands in the Pacific Ocean and vicinity. The exact scope of Oceania is defined variously, with interpretations often including Australia, New Zealand, New Guinea, and various islands of the Malay Archipelago. Ethnologically, the islands of Oceania are divided into the subregions of Melanesia, Micronesia, and Polynesia. Also, the term is often used in many languages to define one of the continents.
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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

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

= 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.