Meaning of “twentieth” in the English Dictionary

"twentieth" in American English

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twentiethadjective, adverb, noun [ C ]

us /ˈtwen·ti·ɪθ/

(in the position of) the number 20 in a series; 20th:

This is our twentieth wedding anniversary.
[ C ] The meeting is on the twentieth of November.

A twentieth is one of twenty equal parts of something.

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