In early use: a member of any of various Slavic peoples of south-eastern Europe, including any or all of the Bosnians, Bulgars, Croats…

A Yugoslav, esp. a person speaking a language belonging to the Serbo-Croat language group; (sometimes spec.) a Croat (now rare).

With reference to a person: = Yugoslav, n. 1.

A native or inhabitant of Yugoslavia or (in later use) its former constituent republics; a Yugoslav.

Jugoslav (see Yugoslav, n. adj.); (also) Jugoslavian.