Learn how to say Britishness correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word British:
1relating to Great Britain or the United Kingdom, or to its people or language.
2of the British Commonwealth or (formerly) the British Empire.
(as plural noun the British)
the British people.
Old English Brettisc ‘relating to the ancient Britons’, from Bret ‘Briton’, from Latin Britto, or its Celtic equivalent