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English definition of “ordinal (number)”

ordinal (number)

noun [C]  /ˈɔr·dən·əl (ˈnʌm·bər)/ us  
a number like 1st, 2nd, 3rd, that shows the position of something in a list of items: In "She was fifth in the race," "fifth" is an ordinal number.
(Definition of ordinal (number) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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