1) a person appointed by two opposite sides to settle a dispute (arbitrator)

2) a group of people appointed (usually by a larger group) to carry out special duties (committee)

3) (placed after the noun) appointed to a position (but not yet installed); to mark or point out (something) clearly (designate)

4) a person who is appointed to carry out the terms of a will (executor)

5) a person appointed to command others in the armed forces, the police force etc; a person with a (public) position of authority (officer)

6) a person appointed to preform the duties of a ruler who is too young, old, ill etc (regent)

7) being or containing an example or examples (of another or others); consisting of elected members; a person elected or appointed to represent or act for others (representative)

8) a group of officials or judges appointed for special duty, e.g. to hear appeals against high rents (tribunal)