Black British

Short definition from Wiktionary

Noun

1. 1
   A variety of English language spoken by or associated with Black people in Britain.
2. 2
   Alternative letter-case form of black British, a social and cultural group consisting of Black Britons.
3. 3
   A social and cultural group in Britain comprising people of Black ethnic origin, sometimes including people of other nonwhite ethnicity.

Adjective

1. 1
   Alternative letter-case form of black British.
2. 2
   Of or related to the social and cultural group of Black or other nonwhite Britons.