an island in the British Isles, in the Irish Sea between Cumbria and Northern Ireland: a British Crown Dependency (but not part of the United Kingdom), with its own ancient parliament, the Court of Tynwald; a dependency of Norway until 1266, when for a time it came under Scottish rule; its own language, Manx, became extinct in the 19th century but has been revived to some extent. Capital: Douglas. Pop: 86 159 (2013 est). Area: 588 sq km (227 sq miles)