Meaning of “eightieth” in the English Dictionary

"eightieth" in American English

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eightiethadjective, adverb, noun [ C ]

us /ˈeɪt̬·i·əθ/

(in the position of) the number 80 in a series; 80th:

They finished eightieth out of a hundred.

An eightieth is one of eighty equal parts of something.

(Definition of “eightieth” from the Cambridge Academic Content Dictionary © Cambridge University Press)