Meaning of “fiftieth” in the English Dictionary

"fiftieth" in American English

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fiftiethadjective, adverb, noun [ C ]

us /ˈfɪf·ti·əθ/

(in the position of) the number 50 in a series; 50th:

a fiftieth wedding anniversary

A fiftieth is one of fifty equal parts of something.

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