Where does “četvrt” come from?
četvrt (Serbo-Croatian) comes from Proto-Slavic četvьrtь, from Proto-Slavic četvьrtъ, from Proto-Balto-Slavic ketwirtas, from Proto-Indo-European *kʷetwr̥tós.
četvrt (Serbo-Croatian): quarter
Ancestry of “četvrt”, step by step