An island in the South Pacific, administratively part of Papua New Guinea, lying to the north of New Britain; population 145,700 (est. 2009); capital, Kavieng.
Definition of New Ireland in US English:
New Ireland
proper noun
An island in the South Pacific Ocean, part of Papua New Guinea, that lies north of New Britain; population 145,700 (est. 2009); capital, Kavieng.