- a seaport in and the capital of Norway, in the SE part, at the head of Oslo Fiord.
- the capital and chief port of Norway, in the southeast at the head of Oslo Fjord (an inlet of the Skagerrak): founded in about 1050; university (1811); a major commercial and industrial centre, producing about a quarter of Norway's total output. Pop: 521 886 (2004 est)
