Webster's English Dictionary

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supernumerary

1. su.per.nu.mer.ary \.su:-p*r-'n(y)u:-m*-.rer-e-, -'n(y)u:m-(*-)re-\ aj 
   [LL supernumerarius, fr. L super- + numerus number - more a]t NIMBLE 1: 
   exceeding the stated or prescribed number  2: SUPERFLUOUS  3: more numerous 
2. supernumerary n 1: a supernumerary person or thing  2: an actor employed 
   to play a walk-on (as in a mob scene or spectacle)