Etymology
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Britain (n.)

proper name of the island containing England, Scotland, and Wales, c. 1300, Breteyne, from Old French Bretaigne, from Latin Britannia, earlier Brittania, from Brittani "the Britons" (see Briton). The Old English place-name Brytenlond meant "Wales." If there was a Celtic name for the island, it has not been recorded.

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Definitions of Britain

Britain (n.)
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;
Synonyms: United Kingdom / uk / U.K. / United Kingdom of Great Britain and Northern Ireland / Great Britain
From wordnet.princeton.edu