Definition of: supernumerary

(s′pər·n′mə·rer′ē, -ny′-) adjective
1. Being beyond a fixed or standard number.
2. Beyond a customary or necessary number; superfluous.
—noun plural ·ar·ies
1. A person or thing in excess of the regular, necessary, or customary number.
2. A stage performer, as in mob scenes or processions, without any speaking part: often contracted to supe or super. [<LL super-numerarius a soldier added to a legion after it is complete <L super numerum <super over + numerus a number]