1 A person or group of people who are members of a larger body or organization and are appointed or elected by the body or organization to consider, investigate, or make recommendations concerning a particular subject or to carry out some other duty delegated to it by the body or organization on an ad hoc or permanent basis. 2 A person who has been civilly committed. 3 The guardian of a civilly committed person or the individual into whose care an incompetent person has been placed. See also ...