supernumerary
adjective /ˌsuːpəˈnjuːmərəri/
/ˌsuːpərˈnuːməreri/
(formal)- more than you normally need; extra
多余的;过剩的;额外的 词源early 17th cent.: from late Latin supernumerarius ‘(soldier) added to a legion after it is complete’, from Latin super numerum ‘beyond the number’.