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'. 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.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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