Meaning of “thirteenth” in the English Dictionary

"thirteenth" in American English

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thirteenthadjective, adverb, noun [ C ]

us /ˌθɜrtˈtinθ/

(in the position of) the number 13 in a series; 13th:

He came in thirteenth in the marathon.
[ C ] The baby was born on the thirteenth of May.

A thirteenth is one of thirteen equal parts of something.

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