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ordinal number
noun [C] maths /ˈɔː(r)dɪn(ə)l ˌnʌmbə(r)/
singularordinal number
pluralordinal numbers
  1. a number such as ‘first' or ‘second' that shows what position something has in a series 序数(如first 或second)
     Synonyms and related words
    Ordinal numbers: billionth, eighth, eleventh...
    See also cardinal number

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