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English definition of “ninth”

ninth

ordinal number uk   /naɪnθ/ us  
A2 9th written as a word: The ninth letter of the alphabet is I. The school term ends on the ninth (of July). She was/came ninth in the national finals.Ordinal numbers

ninth

noun [C] uk   /naɪnθ/ us  
one of nine equal parts of something: A ninth of 27 is 3.Fractions
(Definition of ninth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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