Definition of quadrumvir in English:

quadrumvir

noun

historical
  • A member of a quadrumvirate; one of a group of four leaders or commanders. In later use: a commander in Mussolini's Fascist government in Italy.

Origin

Late 18th century; earliest use found in By-stander. From quadri- + -umvir, after quadrumvirate. In later use after Italian quadrumviro.