chair‧man S3 W1 plural chairmen [countable]
someone, especially a man, who is in charge of a meeting or directs the work of a committee or an organization [↪ chairwoman]
Potts was appointed chairman of the education committee.
deputy/vice chairman! Many people use chairperson or chair instead, to avoid suggesting that this person must be a man.
Barrett serves as vice chairman.
2 British EnglishBOBBB
someone who is in charge of a large company or organization:
the chairman of British Aerospace
Williams has been chairman of the board for five years.