fluent adjective. › (of a ​person) ​able to ​speak a ​language ​easily and well, or (of a ​language) ​spoken ​easily and without many ​pauses: She was fluent in ​French by the ​time she was five. He ​speaks fluent Chinese. fluency noun [U] us /ˈflu·ən·si/ › This ​job ​requires fluency in two or more ​African ​languages.