A man who jointly chairs or leads something with another person; one of two male co-leaders.
From 'co-' (together) plus 'chairman' (a man who presides). This term emerged when shared leadership positions became more formal and needed specific titles.
Terms like 'cochairman' and 'chairwoman' show how English is wrestling with gender—some places now use 'cochair' or 'cochairperson' to avoid assuming the leader's gender!
'-man' suffix became default for professional titles in English by mid-20th century, even when multiple genders held roles. Women cochairs were linguistically erased into 'cochairman.'
Use 'cochair' or 'co-chair' instead; it is inclusive and shorter.
["cochair","co-chair","co-leader"]
Early women in co-leadership roles (academia, nonprofits, 1960s-70s) had their titles defaulted to masculine forms, obscuring their presence in historical records.
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