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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

Time Traveler
The first known use of ordinal number was in 1607

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