Chairman (noun)

1. A person who presides over a meeting or organization.
2. The person who is in charge of an organization or committee.

Origin:

Chair + man; originally chair was used in the sense of the chair of a meeting (as opposed to the seat for the meeting participant).

Examples:

1. The chairman of the committee called the meeting to order.
2. The board of directors elected John as the new chairman for the company.
3. The chairman of the board announced the company's new strategy.
4. During the meeting, the chairman asked for comments from all members.
5. The chairman of the council is elected by its members.