Definition of “seventeenth” - English Dictionary

“seventeenth” in American English

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seventeenthadjective, adverb, noun [ C ]

us /ˌsev·ənˈtinθ/

(in the position of) the number 17 in a series; 17th:

the seventeenth century
[ C ] Her birthday is on the seventeenth.

A seventeenth is one of 17 equal parts of something.

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