Definition of "Empire" :
noun: an eating apple that somewhat resembles a McIntosh; used as both an eating and a cooking apple
noun: a group of countries under a single authority
"The British created a great empire."
noun: a group of diverse companies under common ownership and run as a single organization
noun: a monarchy with an emperor as head of state
noun: the domain ruled by an emperor or empress; the region over which imperial dominion is exercised