eightieth

American  

[ey-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

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

To celebrate his eightieth birthday, the National invited him to direct “Twelfth Night,” in which Rebecca took the role of Viola.

From The New Yorker ● Jun. 3, 2017

This year of 2015 marks the eightieth anniversary of the establishment of diplomatic relations between the Republic of Cuba and the Holy See.

From The Guardian ● Sep. 19, 2015

On his one hundred and eightieth day at the dump, salvation arrived for Edward in a most unusual form.

From "The Miraculous Journey of Edward Tulane" by Kate DiCamillo