Meaning of “fortieth” in the English Dictionary

"fortieth" in American English

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fortiethadjective, adverb, noun [ C ]

us /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” from the Cambridge Academic Content Dictionary © Cambridge University Press)