Meaning of “supernumerary” in the English Dictionary

"supernumerary" in English

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supernumeraryadjective

/ˌsuː.pəˈnjuː.mər.ər.i/ /ˌsuː.pɚˈnuː.mə.rer.i/ formal

in addition to the number usually needed:

Supernumerary teeth often are found in the upper jaw just behind the front teeth.

supernumerarynoun [ C ]

/ˌsuː.pəˈnjuː.mər.ər.i/ /ˌsuː.pɚˈnuː.mə.rer.i/ formal

an extra employee, actor, member of a society, etc.:

They're supernumeraries, the people on an opera stage who neither speak nor sing, yet whose presence in the production is crucial.

(Definition of “supernumerary” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)