The Balto-Slavic language family is composed of a group of related Indo-European languages spoken in Eastern Europe. Some synonyms for this language group include "Baltic-Slavic", "Baltoslavic", and "Slavo-Baltic". The term "Baltic-Slavic" emphasizes the close relationship between the Baltic and Slavic branches of the language family, while the term "Baltoslavic" combines the names of the two branches. "Slavo-Baltic" describes the same relationship, but with the emphasis on the Slavic branch. Other less commonly used synonyms for Balto-Slavic include "Baltoslavonic" and "Baltoslavian". These various terms highlight the complex and interconnected nature of the languages in the Balto-Slavic family.