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

Greater in number than. / Beyond the prescribed or standard amount or number; excess, extra. / (biology, specifically) Of an organ or structure: additional to what is normally present.

plural of supernumerary

The quality of being supernumerary.

plural of supernumerary rainbow

One of the faintly colored bands sometimes seen bordering the violet edge of a rainbow, i.e. inside the primary bow or, much more rarely, outside the secondary.