Definition from Wiktionary, the free dictionary
cochair (plural cochairs)
- Someone who serves as the chair of a meeting or organization together with one or more other chairs.
1988 February 19, Ben Joravsky, “A referendum gorws in the 47th Ward: boosting the current against Com Ed rate hikes”, Chicago Reader:
- "On the referendum, people are asked to vote yes or no," says Hoyt, who is cochair of the Coalition for Lower Electric Rates […] .
- (transitive) To chair (a meeting) jointly.