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Meaning of duumvirate

du•um•vi•rate

Pronunciation: (d-um'vur-it, dy-), [key]
— n.
  1. a coalition of two persons holding the same office, as in ancient Rome.
  2. the office or government of two such persons.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.