Great British
/ˌɡreɪt ˈbrɪtɪʃ/adjective
Of or relating to Great Britain or its inhabitants.
noun
Treated as plural. Chiefly with the. The people of Great Britain collectively; the British. rare.
Origin
Mid 17th century; earliest use found in Dudley North (1602–1677), politician and author. From great + British, after the name of Great Britain.