The office, position, or term of duumvirs; government by two co-rulers; a group of two people in joint authority.
From Latin 'duumviratus,' the office of duumvir. The suffix -ate denotes a state, office, or group (like 'delegate' or 'magistrate').
The duumvirate was Rome's original executive model—imagine if the U.S. always had two Presidents sharing power equally instead of one; that's the Roman idea!
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