noun, plural co·chair·men.
Examples from the Web for co-chairman
It seems Sony Pictures Entertainment co-chairman Amy Pascal is a big fan of the idea, too.
Leaked emails show Sony Pictures Entertainment co-chairman Amy Pascal confessing that the dashing Elba should be 007.
Initially, dozens of schools express interest, says Mike McCurry, co-chairman of the Commission on Presidential Debates.Why Most Colleges Don’t Want to Host a Presidential Debate|Miranda Green|October 22, 2012|DAILY BEAST
Jim Talent, a former Missouri senator and another key Romney adviser, is a co-chairman.Vin Weber, Top Romney Adviser, Lobbying for Ukraine Group|Eli Lake|July 12, 2012|DAILY BEAST
His co-chairman, Alan Simpson, then weighed in with an assertion that it would happen in less than two years.