Definition of “fifteenth” - English Dictionary

“fifteenth” in American English

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fifteenthadjective, adverb, noun [ C ]

us /fɪfˈtinθ/

(in the position of) the number 15 in a series; 15th:

Our team is ranked fifteenth in the country.
[ C ] Her birthday is on the fifteenth of May.

A fifteenth is one of fifteen equal parts of something.

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