N-VAR
(委员会、组织机构的)主席身份，主席任期
The chairmanship of a committee or organization is the fact of being its chairperson. Someone's chairmanship can also mean the period during which they are chairperson.
例句
The Government has set up a committee under the chairmanship of Professor Roy Goode.
政府设立一个委员会，任命罗伊·古德教授为主席。