supernumerary
Pronunciation: /ˌsuːpəˈnjuːm(ə)r(ə)ri, ˌsjuː-/
Definition of supernumerary
adjective
noun ( plural supernumeraries)
Origin:
early 17th century: from late Latin supernumerarius '(soldier) added to a legion after it is complete', from Latin super numerum 'beyond the number'