An island in the western South Pacific, off the north coast of Australia, the second largest island in the world (following Greenland). It is divided into two parts; the western half comprises the Indonesian provinces of Papua and West Papua, the eastern half forms part of Papua New Guinea.
Definition of New Guinea in US English:
New Guinea
proper nounn(y)o͞o ˈɡinē
An island in the western South Pacific Ocean, off the northern coast of Australia, the world's second largest island. It is divided into two parts; the western half comprises the Indonesian provinces of Papua and West Papua; the eastern half forms part of Papua New Guinea.