- a country that comprises approximately four fifths of Ireland; population 4,203,200 (est. 2009); capital, Dublin; languages, Irish (official) and English. Also called Irish Republic.
Ireland was partitioned by the Government of Ireland Act (1920), which divided the island into two self-governing areas. The Anglo-Irish Treaty, signed in 1921, gave Southern Ireland dominion status as the Irish Free State. The treaty was followed by civil war between the Free State government and the republicans, led by Eamon de Valera, who rejected partition. The war ended in victory for the government in 1923. A new constitution as a sovereign state (Eire) was adopted in 1937. Eire remained neutral during World War II; in 1949 it left the Commonwealth of Nations and became fully independent as the Republic of Ireland