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or'dinal num'ber

1. Also called or'dinal nu'meral. any of the numbers that express degree, quality, or position in a series, as first, second, and third (distinguished from cardinal number).
2. Math.a symbol denoting both the cardinal number and the ordering of a given set, being identical for two ordered sets having elements that can be placed into one-to-one correspondence, the correspondence preserving the order of the elements.

ordinal

ordinance

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ordinal number (Thesaurus)

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or'dinal num'ber

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