DictionaryRoot: imperium
Latin
imperium
command, supreme power, empire
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adjective
imperial
im-PEER-ee-uhl/ɪmˈpɪriəl/
Relating to or suggesting the authority or grandeur of an empire or emperor.
Etymology
Imperium covered both supreme governing power and the realm under that power. Imperial therefore relates to an empire or to the emperor who exercises its authority.