Definition of “ninetieth” - English Dictionary

“ninetieth” in American English

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ninetiethadjective, adverb, noun [ C ]

us /ˈnɑɪn·ti·əθ/

(in the position of) the number 90 in a series; 90th:

He finished ninetieth in the marathon.
Mine was the ninetieth signature on the petition.

A ninetieth is one of ninety equal parts of something.

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

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