The term ONE ON A BOARD is a phrase used to describe a person who is in a position of authority on a board or committee. The crossword solutions for this term are TRUSTEE (7 letters) and COMMITTEEMEMBER (15 letters). A TRUSTEE is someone who is appointed to manage the affairs of an organization, while a Committeemember is someone who is part of a committee that is responsible for making decisions on behalf of a larger group.