noun (n)

• the domain ruled by an emperor or empress; the region over which imperial dominion is exercised(noun.location)

  Synonym:
  imperium
  

  source: wordnet30
• a group of countries under a single authority(noun.group)

  Example:
  The British created a great empire.
  

  source: wordnet30
• a monarchy with an emperor as head of state(noun.group)

  source: wordnet30
• a group of diverse companies under common ownership and run as a single organization(noun.group)

  Synonym:
  conglomerate
  

  source: wordnet30
• an eating apple that somewhat resembles a McIntosh; used as both an eating and a cooking apple(noun.food)

  source: wordnet30
• Supreme power; sovereignty; sway; dominion.(noun)

  source: webster1913