“Hausa: Chadic language, native to northern Nigeria (roughly from Kaduna northwards and some 200 km east of Kano westwards) and neighboring parts of Niger. Also widespread as a second language, there and elsewhere, and as a lingua franca across West Africa. Written in Arabic script before the 20th century, now largely in Roman.”
Excerpted from: Marshall, P.H., ed. The Oxford Concise Dictionary of Linguistics. New York: Oxford University Press, 2014.