eightieth

American  

[ay-tee-ith] / ˈeɪ ti ɪθ /

adjective

1. next after the seventy-ninth; being the ordinal number for 80.

2. being one of 80 equal parts.

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noun

1. an eightieth part, especially of one (1/80).

2. the eightieth member of a series.

eightieth British  

/ ˈeɪtɪɪθ /

adjective

1. (usually prenominal)

   1. being the ordinal number of eighty in numbering or counting order, position, time, etc: often written 80th

   2. ( as noun )

      the eightieth in succession

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noun

1. 1. one of 80 approximately equal parts of something

   2. ( as modifier )

      an eightieth part

2. the fraction equal to one divided by 80 ( 1/ 80 )

Etymology

Origin of eightieth

1350–1400; Middle English eightetithe, Old English ( hund ) eahtatigotha eightieth. See eighty, -th ²

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Example Sentences

See Examples For:

eightieth

At the time, scientists thought that something as small as viroids, which are one eightieth the size of many viruses, were too minuscule to cause an infection.

From New York Times ● May 8, 2023

“In a hotel mirror, I have seen with surprise an old man in his eightieth year, then forgotten him,” Thubron wrote.

From Washington Post ● Sep. 29, 2021

Entering his eightieth decade he hasn’t lost his taste for that whiff of adventure, either in his walking or his writing.

From The Guardian ● Apr. 14, 2019

My father called in early January to say that, on the eve of his eightieth birthday, he had been forced to take a driving test.

From The New Yorker ● Jan. 26, 2015

I got to know him at Abuelo Guillermo’s eightieth birthday party two years ago in Miami.

From "Dreaming in Cuban" by Cristina García

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