ordinal number(redirected from Ordinal (mathematics))
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1. a number denoting relative position in a sequence, such as first, second, third
2. Logic Maths a measure of not only the size of a set but also the order of its elements
ordinal number[′ȯrd·nəl ′nəm·bər]
A generalized number which expresses the size of a set, in the sense of “how many” elements.