cochairperson
noun
co·chair·per·son
ˌkō-ˈcher-ˌpər-sən
plural cochairpersons
: one of two or more chairpersons who preside jointly over something (such as a meeting, organization, committee, event, or department): cochair
She was also cochairperson, along with the New York City parks commissioner, of the Evenings-by-the-River committee …—William Edward Nelson
He is cochairperson of the Colorado chapter of the Gay, Lesbian, and Straight Education Network …—Wallace Swan
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Merriam-Webster unabridged
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