The imperial palace is a symbol of the country's history and culture.

Imperialism led to the colonization of many countries.

She spoke imperiously, demanding everyone's attention.

She spoke in an imperious tone, demanding everyone's attention.

The car's fuel tank can hold up to 10 imperial gallons of gasoline.

The imperialist powers sought to expand their territories through colonization.

The imperialistic powers of the 19th century sought to expand their empires through colonization and conquest.