ordinal

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ordinal

(mathematics)
An isomorphism class of well-ordered sets.
References in periodicals archive ?
What are the lowest, shortest, highest and longest truthful ordinal numbers?
What are the smallest and largest Arabic number names, cardinal and ordinal, evenly divisible by, or into, the product of their contained Roman numerals (A/R or R/A is an integer)?
None of either occurs, cardinal or ordinal, surprisingly, unless you count nth.