RoussillonPronunciation: /ˈruːsɪjɒn, ʀusijɔ̃/Definition of Roussillon a former province of southern France, on the border with Spain in the eastern Pyrenees, now part of Languedoc-Roussillon. Part of Spain until 1659, Roussillon retains many of its Spanish characteristics and traditions and Catalan is widely spoken.
