a kingdom of SW Europe, occupying the Iberian peninsula between the Mediterranean and the Atlantic: a leading European power in the 16th century, with many overseas possessions, esp in the New World; became a republic in 1931; under the fascist dictatorship of Franco following the Civil War (1936–39) until his death in 1975; a member of the European Union. It consistschiefly of a central plateau (the Meseta), with the Pyrenees and the Cantabrian Mountains in the north and the Sierra Nevada in the south. Official language: Castilian Spanish, with Catalan, Galician, and Basque official regional languages. Religion: Roman Catholic majority. Currency: euro. Capital: Madrid. Pop: 43 815 774 (2017 est). Area: 504 748 sq km (194 883 sq miles)