Imperial means relating to an empire or emperor. An imperial palace is one where an emperor lives, and imperial power is the kind of authority an emperor holds over vast territories.

Throughout history, imperial rulers governed enormous regions spanning multiple countries and cultures. The Roman Empire had imperial legions that marched across Europe, Africa, and Asia. China's imperial dynasties ruled for thousands of years, with elaborate imperial courts and ceremonies. When historians talk about imperial Britain, they mean the period when Britain controlled colonies around the world.

The word carries a sense of grandeur and might. An imperial decree is a command issued by an emperor that everyone must follow. Imperial architecture tends to be massive and magnificent, designed to demonstrate power and wealth. You might read about the imperial throne room in ancient Persia or the imperial gardens in Japan.

Imperial can also describe something impressively large or majestic, even without referring to actual empires. Someone with an imperial manner acts commanding and dignified, like royalty.