a republic in S Europe, occupying a peninsula in the Mediterranean between the Tyrrhenian and the Adriatic Seas, with the islands of Sardinia and Sicily to the west: first united under the Romans but became fragmented into numerous political units in the Middle Ages; united kingdom proclaimed in 1861; under the dictatorship of Mussolini (1922–43); became a republic in 1946; a member of the European Union. It is generally mountainous, with the Alps in the north and the Apennines running the length of the peninsula. Official language: Italian. Religion: Roman Catholic majority. Currency: euro. Capital: Rome. Pop: 59 359 900 (2017 est). Area: 301 247 sq km (116 312 sq miles)