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

My parents will be having their fiftieth wedding anniversary this year.

From Slate • Feb. 3, 2023

McCartney, who first performed at Glastonbury in 2004, had been due to take part in the fiftieth anniversary edition of the festival in 2020 before it was cancelled because of the COVID-19 pandemic.

From Reuters • Jun. 25, 2022

And my fiftieth wedding anniversary—that was a beautiful occasion.

From "Our America: Life and Death on the South Side of Chicago" by LeAlan Jones