chairman

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The presiding officer of an assembly, meeting, committee, or board.
• noun The administrative head of a department of instruction, as at a college.
• transitive verb To act as chairman of.

from The Century Dictionary.

• noun pl. chairmen (-men).
• noun The presiding officer of an assembly, association, company, committee, or public meeting.
• noun One who assists in Carrying a sedan-chair. Prior. Also called chair-bearer.
• noun One who wheels an invalid's or other similar chair.

from the GNU version of the Collaborative International Dictionary of English.

• noun The presiding officer of a committee, or of a public or private meeting, or of any organized body.
• noun One whose business it is to cary a chair or sedan.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A person (implied male) presiding over a meeting.
• noun The head of a corporate or governmental board of directors, a committee, or other formal entity.
• noun historical Someone whose job is to carry people in a portable chair, sedan chair, or similar conveyance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the officer who presides at the meetings of an organization
• verb act or preside as chair, as of an academic department in a university