1. one of two or more princes who rule jointly or share sovereignty over the same territory or state
Usage: formal; historical or political

Examples

• The two coprices of Andorra shared executive authority under the constitutional framework.
• In medieval times, coprices sometimes ruled side by side to prevent the concentration of power.
• The treaty established the two brothers as coprices of the principality.
• Coprices were required to make major decisions by mutual consent.