fiftieth

American  

[fif-tee-ith] / ˈfɪf ti ɪθ /

adjective

1. next after the forty-ninth; being the ordinal number for 50.

2. being one of 50 equal parts.

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noun

1. a fiftieth part, especially of one (1/50).

2. the fiftieth member of a series.

fiftieth British  

/ ˈfɪftɪɪθ /

adjective

1. 1. being the ordinal number of fifty in order, position, time, etc. Often written: 50th

   2. ( as noun )

      the fiftieth in the series

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noun

1. 1. one of 50 equal or approximately equal parts of something

   2. ( as modifier )

      a fiftieth part

2. the fraction equal to one divided by 50 ( 1/ 50 )

Etymology

Origin of fiftieth

before 1000; Middle English fiftithe, Old English fīftigotha. See fifty, -th ²

Example Sentences

A US congressional panel has released a redacted copy of an alleged "birthday book" given to Jeffrey Epstein in 2003 celebrating his fiftieth birthday.

From BBC • Sep. 9, 2025

It weighs less than one fiftieth of a gram; significantly less than current state-of-the-art pacemakers, which weigh at least five grams.

From Science Daily • Feb. 21, 2024

"As my term as High Commissioner draws to a close, this Council's milestone fiftieth session will be the last which I brief," she said, without giving a reason.

From Reuters • Jun. 13, 2022

This year is the fiftieth anniversary of the Supreme Court’s decision in Furman v.

From Slate • Feb. 22, 2022

In the nearly eight years that he lived in Hungary, he only managed to convince her to see him a few times—once when she attended his fiftieth birthday party in Bulgaria.

From "Endgame" by Frank Brady