Benue-CongoPronunciation: /ˈbɛnweɪ/Definition of Benue-Congo adjective relating to or denoting a major branch of the Niger-Congo family of languages, spoken mainly in Nigeria and including Efik and Fula. noun [mass noun] the Benue-Congo group of languages. Origin:from the names of riversBenue-Congo in other Oxford dictionaries Definition of Benue-Congo in the US English dictionary