I'rish Repub'lican Ar'my
an underground Irish nationalist organization founded to work for Irish independence from Great Britain: declared illegal by the Irish government in 1936, but continues activity aimed at the unification of the Republic of Ireland and Northern Ireland. Abbr.: IRA, I.R.A.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.