Sinn Féin /ˌʃɪn ˈfeɪn/ BrE AmE
an Irish political party, active especially in Northern ireland, which wants Northern Ireland to become part of the Republic of Ireland. It is sometimes called the ‘political wing of the IRA’, and in the past supported the use of violence against British rule in Northern Ireland. From the mid-1990s, Sinn Féin had an active part in the ‘peace process’ (=the attempts to achieve a peaceful solution to the problems of Northern Ireland) under its president Gerry ↑ Adams .