Why the roman empire is considered an empire?

The Roman Empire is considered an empire due to its extensive territorial expansion and centralized authority, which allowed it to dominate vast regions across Europe, North Africa, and parts of the Middle East. It was characterized by a complex administrative system, a standing army, and a network of roads that facilitated trade and communication. The empire's cultural and legal influence spread widely, and it integrated diverse peoples under a common governance and legal framework. This combination of military power, political organization, and cultural assimilation solidified its status as a prominent empire in history.