1. (n.)New Guinea a largeisland N of Australia, politically divided into the Indonesian province of Irian Jaya (West Irian) and the independent country of Papua New Guinea. 3,480,000; ab. 316,000 sq. mi. (818,000 sq. km).
2. New Guinea Trust Territory of, a former United Nations trust territory that included NE New Guinea, the Bismarck Archipelago, Bougainville, and other islands, administered by Australia jointly with the Territory of Papua until 1975: now part of Papua New Guinea.
Definition of 'new guinea'
Princeton's WordNet
1. (noun)New Guinea a Pacific island to the north of Australia; the 2nd largest island in the world; the western part is governed by Indonesia and the eastern part is Papua New Guinea
Definitions of 'new guinea'
The Nuttall Encyclopedia
1. new guinea the largest island in the world (excluding the island continents of Australia and Greenland), lies N. of Australia, from which it is divided by Torres Strait (90 m. wide); is an irregular, mountainous, well-rivered territory, 10 times the size of Scotland, and is held by three European powers—the Dutch (200) in the western and least developed half; the German (100); in the NE., Kaiser Wilhelm's Land, administered by the German New Guinea Company, who export tobacco, areca, bamboo, ebony, &c.; and the British (135), in the SE., administered by the Commonwealth of Australia. Successful encouragement has been given to colonisation, and good exports of gold pearl-shells, copra, &c., are made. Much of the interior is still to explore, and is inhabited by Papuans, Negritoes, and other Melanesian tribes, many of which are still in the cannibal stage, although others are peaceful and industrious. A hot moist climate gives rise to muchendemic fever, but encourages a wonderful profusion of tropical growth, givingplace in the highlands to the hardier oak and pine, and still higher to a purely alpine flora; as in Australia, the animals are chiefly marsupials; the mountain ranges, which stretch in a more or less continuous line throughout the island, have peaks that touch an altitude of 20,000 ft. and send down many navigable streams. Port Moresby is the capital of the Britishportion.
Definitions of new guinea 
