Supernumerary

Noun

 * 1) A civil designation for somebody who works in a group, association or public office, without forming part of the regular staff; those distinguished from numerary. (For example, supernumerary judges are those who help the regular judges when there is a surplus amount of work.)
 * 2) An extra or walk-on in a film or play; spear-carrier.

Adjective

 * 1) Extra; beyond the standard or prescribed amount.
 * 2) Greater in number than.
 * 3) Beyond what is necessary.