Definition of "Imperial" :

noun: a piece of luggage carried on top of a coach

noun: a small tufted beard worn by Emperor Napoleon III

adjective: belonging to or befitting a supreme ruler

"Golden age of imperial splendor."

adjective: befitting or belonging to an emperor or empress

"Imperial palace."

adjective: relating to or associated with an empire

"Imperial colony."

adjective: of or belonging to the British Imperial System of weights and measures