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English definition of “thirteenth”

thirteenth

ordinal number uk   /θɜːˈtiːnθ/ us    /θɝː-/
13th written as a word: My birthday is on the thirteenth (of October).Ordinal numbers

thirteenth

noun [C] uk   /θɜːˈtiːnθ/ us    /θɝː-/
one of thirteen equal parts of somethingFractions
(Definition of thirteenth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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