Etymology
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imperium (n.)

"authority to command the national military forces," in extended use "an empire," 1650s, from Latin imperium "command, supreme authority, power" (see empire). Hence Latin phrase imperium in imperio "a state within a state."

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Definitions of imperium

imperium (n.)
the domain ruled by an emperor or empress; the region over which imperial dominion is exercised;
Synonyms: empire
imperium (n.)
supreme authority; absolute dominion;
From wordnet.princeton.edu