A person who works in a group, association, or public office without forming part of the regular staff (the numerary).

“The judge was a supernumerary, helping the regular judges whenever there was a surplus amount of work.”

An extra or walk-on, often non-speaking, in a film or play; a spear carrier.

Something which is beyond the prescribed or standard amount or number.

Greater in number than.

Beyond the prescribed or standard amount or number; excess, extra.

Beyond what is necessary; redundant.