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English definition of “ordinal”

ordinal

noun [C]     /ˌɔː.dɪ.nəl/ US  /ˌɔːr.dən.əl/ (also ordinal number)
a number such as 1st, 2nd, 3rd, 4th, that shows the position of something in a list of things: Ordinal numbers are used in these sentences : 'She was fifth in the race ' and 'They celebrated the 200th anniversary of the university's foundation '. → Compare cardinal nounNumbers generally
(Definition of ordinal noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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