Irish National Liberation Army Syllabification: (I·rish Na·tion·al Lib·er·a·tion Ar·my) (abbreviation: INLA)Definition of Irish National Liberation Army a small paramilitary organization seeking union between Northern Ireland and the Republic of Ireland. It was formed in the early 1970s, probably as an offshoot of the Provisional IRA. Irish National Liberation Army in other Oxford dictionaries Definition of Irish National Liberation Army in the British & World English dictionary