1. a group of four people acting together, especially in a position of authority or control
Usage: formal

Examples

• The quadrumvirate of senior executives made all major company decisions.
• A quadrumvirate of generals led the military coup.
• The school was governed by a quadrumvirate of administrators.
• The quadrumvirate controlled the city’s political landscape for decades.
• After the merger, a quadrumvirate was formed to oversee operations.
• The quadrumvirate met weekly to discuss policy changes.