cohostess noun 1verb 1forms 3 noun1 •A female cohost.Julia Meade assisted Ed as cohostess and chief product seller during and for a while after his Toast of the Town years. — 1971 verb1 •(rare) Of a woman: To act as a joint host.Erna had dragooned a reluctant Frau Ostlinger into cohostessing a lavish party at the consulate for the children of all the more prominent German-American families in New York. — 1979 formscohostessed · cohostessing · cohostesses