n. [ From the Finians or Fenii, the old militia of Ireland, who were so called from Fin or Finn, Fionn, or Fingal, a popular hero of Irish traditional history. ] A member of a secret organization, consisting mainly of Irishmen, having for its aim the overthrow of English rule in Ireland. [ 1913 Webster ]

a. Pertaining to Fenians or to Fenianism. [ 1913 Webster ]

n. The principles, purposes, and methods of the Fenians. [ 1913 Webster ]