What is the meaning of Supernumerary?

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

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.

An animal which has not formed a pair bond and is therefore single.

A married man or woman who is a secular member of Opus Dei, a Roman Catholic religious institution.

Greater in number than.

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

Of an organ or structure: additional to what is normally present.

Beyond what is necessary; redundant.

Source: wiktionary.org