| a Turkish sultanate of southwestern Asia and northeastern Africa and southeastern Europe; created by the Ottoman Turks in the 13th century and lasted until the end of World War I; although initially small it expanded until it superseded the Byzantine Empire | a monarchy with an emperor as head of state |
| | a group of countries under a single authority |
| | a group of diverse companies under common ownership and run as a single organization |
| | the domain ruled by an emperor or empress; the region over which imperial dominion is exercised |