Meaning of “ninth” in the English Dictionary

"ninth" in American English

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ninthadjective, adverb, noun [ C ]

us /nɑɪnθ/

(in the position of) the number 9 in a series; 9th:

She currently ranks ninth in the world.
[ C ] Election day falls on the ninth of November this year.

A ninth is one of nine equal parts of something.

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