- former name (1918–29) of Yugoslavia.
- formerly, a federal republic in S Europe: since 1992 comprised of Serbia and Montenegro; disbanded into independent countries in 2006. 39,449 sq. mi. (102,173 sq. km). Capital: Belgrade.
- Formerly Kingdom of the Serbs, Croats, and Slovenes. a republic in S Europe on the Adriatic: formed 1918 from the kingdoms of Serbia and Montenegro and part of Austria-Hungary; a federal republic 1945-91 comprised of Bosnia and Herzegovina, Croatia, Macedonia, Montenegro, Serbia, and Slovenia.
- Federal Republic of Yugoslavia a former country in SE Europe, comprising Serbia and Montenegro, that was formed in 1991 but not widely internationally recognized until 2000; it was replaced by the Union of Serbia and Montenegro in 2003 (dissolved 2006)
- a former country in SE Europe, on the Adriatic: established in 1918 from the independent states of Serbia and Montenegro, and regions that until World War I had belonged to Austria-Hungary (Croatia, Slovenia, and Bosnia-Herzegovina); the name was changed from Kingdom of Serbs, Croats, and Slovenes to Yugoslavia in 1929; German invasion of 1941–44 was resisted chiefly by a Communist group led by Tito, who declared a people’s republic in 1945; it became the Socialist Federal Republic of Yugoslavia in 1963; in 1991 Slovenia, Croatia, and Bosnia-Herzegovina declared independence, followed by Macedonia in 1992; Serbia and Montenegro formed the Federal Republic of Yugoslavia, subsequently (2003) replaced by the Union of Serbia and Montenegro (dissolved 2006)
Republic in southeastern Europe, on the Balkan Peninsula, bordered by Hungary to the north, Bulgaria and Romania to the east, Macedonia and Albania to the south, the Adriatic Sea and Bosnia and Herzegovina to the west, and Croatia to the northwest. Its capital and largest city is Belgrade.