noun, plural imperia [im-peer-ee-uh] , imperiums.
command; supreme power.
area of dominion; sphere of control or monopoly; empire.
a nation having or exerting supreme power; superpower.
Law. the right to command the force of the state in order to enforce the law.

1645–55; < Latin: supreme administrative power, authority, empire, equivalent to imper(āre) to rule (see imperative) + -ium -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
imperium (ɪmˈpɪərɪəm)
n , pl -ria
1.  (in ancient Rome) the supreme power, held esp by consuls and emperors, to command and administer in military, judicial, and civil affairs
2.  the right to command; supreme power
3.  a less common word for empire
[C17: from Latin: command, empire, from imperāre to command; see emperor]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He had space: the great imperium with its eleven time zones, the distances that gave their blessing to exile and isolation.
Consuls and praetors held imperium, officially sanctioned absolute power, although they were constrained in three important ways.
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