Definition: The word "Regic" was used by the ancient Greeks to refer to the city-state or kingdom that existed in ancient Rome, particularly after its fall from power. In ancient Rome, Regic (regio) meant "city," especially when applied to a state's capital city, such as Rome itself. The term was also used for other cities and states that were part of the Roman Empire. Regi refers to the region or domain where Regic was located. In modern contexts, it often refers to the center of a certain political, social, or cultural entity in Rome or across the empire. The word "regency" is another ancient term used by the Romans for their central government. It meant the rule of an emperor's son during his lifetime. In summary, Regic was used as a term to refer to Rome's capital and the region it governed; while regia meant the rule of the emperor in modern contexts.