1. a government or ruling body consisting of two people
Usage: formal
2. any partnership or alliance between two people or groups

Examples

• The ancient Roman duumvirate shared power equally between the two consuls.
• The company was run by a duumvirate of co-founders who made all major decisions together.
• The political duumvirate controlled the party for over a decade.
• Their business duumvirate proved highly successful in the competitive market.
• The duumvirate dissolved when the two partners disagreed on the company’s direction.
• Historical records show that the duumvirate was an effective form of shared governance.