单词	ordinal number
释义	ordinal number noun 1 : a number designating the place (such as first, second, or third) occupied by an item in an ordered sequence see Table of Numbers 2 : a number assigned to an ordered set that designates both the order of its elements and its cardinal number Example Sentences Recent Examples on the Web Interestingly enough, Kruskal's tree theorem required non-finite mathmatics to prove, using advanced techniques such as transfinite arithmetic and ordinal numbers. Jay Bennett, Popular Mechanics, 20 Oct. 2017 Word History First Known Use 1607, in the meaning defined at sense 1 Kids Definition ordinal number noun : a number that is used to show the place (as first, fifth, 22nd) taken by an element in a series
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