Black British are British citizens of Black origins or heritage, including those of African-Caribbean (sometimes called "Afro-Caribbean") background, and may include people with mixed ancestry. The term has been used from the 1950s, mainly to refer to Black people from former British colonies in the West Indies (i.e., the New Commonwealth) and Africa, who are residents of the United Kingdom and who consider themselves British.
Literature, most generically, is any body of written works. More restrictively, literature writing is considered to be an art form, or any single writing deemed to have artistic or intellectual value, often due to deploying language in ways that differ from ordinary usage.
The death of Dr. Hudson is a loss to the republick of letters.
William King, letter (Jan. 7, 1719). Same phrase occurs in the Spectator. Commonwealth of letters is used by Addison, Spectator, No. 529. Nov. 6, 1712.
A beautiful literature springs from the depth and fullness of intellectual and moral life, from an energy of thought and feeling, to which nothing, as we believe, ministers so largely as enlightened religion.