co-chairman
UK: ˌkəʊˈtʃeəmən | US: ˌkoʊˈtʃermən
n. a person who shares the position of chairman with one or more others; a joint chairman
The word "co-chairman" combines the prefix "co-" (from Latin "com-," meaning "together") with "chairman," which itself derives from "chair" (Old French "chaiere," meaning "seat of authority") and "man" (Old English "mann," meaning "person"). The term reflects a shared leadership role, emphasizing collaboration. Historically, "chairman" referred to the person presiding over a meeting, and "co-" was added to denote joint responsibility.
The committee appointed two co-chairmen to lead the project.
As co-chairman, he worked closely with his counterpart to organize the conference.
She served as co-chairman of the board for three years.
The co-chairmen disagreed on the budget allocation.
Both co-chairmen signed the final report.