Great Britain n 1: a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom [syn: {United Kingdom}, {UK}, {U.K.}, {Britain}, {United Kingdom of Great Britain and Northern Ireland}, {Great Britain}] 2: an island comprising England and Scotland and Wales [syn: {Great Britain}, {GB}]