SLAVIC -  Of or pertaining to the Slavs, their language, literature:

- a people who inhabit most of Eastern (& some Central) Europe;

Late 14c. Sclave - shortening of autonym Slověninъ from Proto-Slavic sloveninu, from Latin Sclavus, Byzantine Greek Sklabos. Folk etymology connects it to slava = glory, fame (reflected in the use of -slav in personal names; e.g. Russian Miroslav = peaceful fame or Czech Bohuslav = God's glory)

More likely related to slovo = word, speech, suggesting it originally identified a broad language community, [i.e. - "we who understand each others speech"] rather than a specific ethnic, community. (In contrast to the Slavic word for the foreign, Germanic peoples němьcь = silent, mute people [i.e. - "those whose speech we cannot understand"] [from Slavic němъ = mute, mumbling].

In English it is the source of the word SLAVE, as the original most common European slaves were in fact white Slavs, not black Africans.

SLAVIC Countries include Russia, Poland, Ukraine, Belorussia, the Czech Republic, Slovenia, Slovakia & most of the Balkans [Serbia*, Bosnia, Bulgaria, Croatia, Macedonia, Montenegro]

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 * Both slava and slovo are connected to the root sluh = hearing, [from PIE🔍 root kleu = to hear]

** Kosovo is not considered Slavic as most of it's inhabitants are actually Albanian, which is in fact, the source of it's historical conflict with Serbia