n. 主席

[ noun ]
the officer who presides at the meetings of an organization
<noun.person>
address your remarks to the chairperson

chairperson \chairperson\ n.
the officer who presides at the meetings of an organization;
-- same as {chair[3]} or {chairman[1]}, but used to achieve a
sex-neutral register.

Syn: president, chairman, chairwoman, chair.
[WordNet 1.5 +PJC]