Definitions

1. noun

two or more persons who jointly occupy a position of leadership, especially in a committee or organization

“The cochairmen of the conference committee presented the final report to the assembly.”

2. plural noun

the two or more persons who jointly occupy a position of leadership, especially in a committee or organization

“The cochairmen played a crucial role in resolving the dispute.”

3. noun

a person who shares the position of leadership of a committee or organization

“The cochairman of the event gave a warm welcome to the guests.”