a kingdom in NW Europe, consisting of Great Britain and Northern Ireland: formerly comprising Great Britain and Ireland 1801–1922. 55,900,000; 94,242 sq. mi. (244,100 sq. km). Cap.: London. Abbr.: U.K. Official name, Unit'ed King'dom of Great" Brit'ain and North'ern Ire'land.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.