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English definition of “seventieth”

seventieth

adjective, adverb, noun [C]    /ˈsev·ən·ti·əθ/
(in the position of) the number 70 in a series; 70th: Today is his seventieth birthday. A seventieth is one of 70 equal parts of something.
(Definition of seventieth adjective, adverb, noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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