Definition of: Fenian

(fē′nē·ən, fēn′yən) noun
1. A member of an Irish society called the Fenian Brotherhood, formed in New York in 1857 to seek independence for Ireland.
2. One sympathizing with the Fenian Brotherhood.
3. One of the Fianna, the warriors of Fionn MacCumal, Irish chieftain of the second and third centuries.
—adjective Of or belonging to, composed of, or characteristic of the Fenians or the Fianna. [<Irish Fiann, a legendary Irish warrior; infl. by OIrish fene an Irishman]
—Fe′ni·an·ism noun