supernumerary

su·per·nu·mer·ar·y

1. Exceeding a fixed, prescribed, or standard number; extra.
2. Exceeding the required or desired number or amount; superfluous. See Synonyms at superfluous.

1. One that is in excess of the regular, necessary, or usual number.
2. An actor without a speaking part, as one who appears in a crowd scene.

Origin: Latin supernumerārius : super, above; see super-  + numerum, accusative of numerus, number; see nem- in Indo-European roots.