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English definition of “millionth”

millionth

ordinal number uk   /ˈmɪl.jənθ/ us  
1,000,000th written as a word: Coventry City football club counted their millionth supporter through the gates last Saturday.informal They're showing "High Noon" on TV for the millionth time (= having already shown it a lot of times).Ordinal numbers

millionth

noun [C] uk   /ˈmɪl.jənθ/ us  
one of a million equal parts of something: a/one millionth of a secondFractions
(Definition of millionth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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