Yu·go·sla·vi·a /ˌjuːɡəʊˈslɑːviə/ a former country in southeast Europe. It existed from the 1920s until the early 1990s, and was made up of six republics: Slovenia, Croatia, Bosnia-Herzegovina, the former Yugoslav Republic of Macedonia, Serbia, and Montenegro. Serbia and Montenegro combined to form one country in 2003, and the other republics became separate, independent countries during the 1990s. → see also Bosnian War, the, Federal Republic of Yugoslavia, the, Tito, Marshal Josip Broz —Yugoslav /ˈjuːɡəʊslɑːv/Yugoslavian /ˌjuːɡəʊˈslɑːviən/ noun , adjective