1. (Of a component) that helps make up or complete a unit or a whole (a constituent element of the criminal offense).
2. (Of an assembly) able to frame or amend a constitution (a constituent council).
constituent, n.
1. A person who gives another the authority to act as a representative; a principal who appoints an agent.
2. Someone who is represented by a legislator or other elected official.
3. One part of something that makes up a whole; an element. — constituency, n.