Other forms: chairmen; chairmanned; chairmaned; chairmanning
A chairman is the leader of a business meeting or group. The chairman often opens a meeting by addressing the group and explaining what the agenda will be.
Charities, clubs, and the boards of companies have a chairman who acts as president or leader. The noun chairman can refer to this person, whether male or female, though sometimes a woman is called a chairwoman. These days, it's more common still to simply call her (or him) a chair. The word chairman comes from a sense of "occupying a chair of authority," while "presiding member of a corporate body" first emerged in the 18th century.