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English definition of “fortieth”

fortieth

adjective, adverb, noun [C]    /ˈfɔr·t̬i·əθ/
(in the position of) the number 40 in a series; 40th: He married in his fortieth year. A fortieth is one of forty equal parts of something.
(Definition of fortieth adjective, adverb, noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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