Sinn Fein

UK: /ˌʃɪn ˈfeːn/ US: (shin′ fān′)

WordReference Random House Unabridged Dictionary of American English © 2026

Sinn Fein  (shin′ fān′), 

1. Government a political organization in Ireland, founded about 1905, advocating the complete political separation from Great Britain of a unified Ireland.
2. Government a member of this organization.

• Irish sinn féin we ourselves

Sinn′ Fein′er. 
Sinn′ Fein′ism. 

Collins Concise English Dictionary © HarperCollins Publishers::

Sinn Féin / ˈʃɪn ˈfeːn/ noun

1. a political movement, founded in 1905, that campaigns for a united republican Ireland; following a split in the 1920s it functioned as the political wing of the IRA; it sends representatives to both the Northern Ireland Assembly in Belfast and the Dáil in Dublin, but its MPs elected to Westminster do not take up their seats

Etymology: 20th Century: from Irish: we ourselves

Sinn Féiner noun

Sinn Féinism noun