A "powerful empire" refers to a strong and dominant state or kingdom that has a lot of control, influence, and military might over a large territory or group of people. Full definition
She ruled some 2 million people and oversaw one of most powerful empires of the ancient world. (discovermagazine.com)
A local Maya guide illuminates the lifestyle and culture of this once powerful empire while keeping an eye out for the area's abundant wildlife. (adventuresmithexplorations.com)
Lords Online is a 2D Browser - Based MMORTS that allows you to build powerful empires and train heroes to lead your armies into battle. (mmogames.com)