original_query: What is the definition of Eastern Europe?
query: What is the definition of Eastern Europe?
answer: There is no single, universally agreed-upon definition of Eastern Europe.  Definitions vary based on geopolitical, geographical, ethnic, cultural, and socioeconomic factors. Some definitions focus on cultural influences (East Slavic, Greek, Byzantine, Eastern Orthodox, Ottoman), while others relate to the Cold War era (Eastern Bloc, formerly communist states).  The western boundary is particularly fluid and debated, lacking a clear geographical demarcation.