seventieth

American  

[sev-uhn-tee-ith] / ˈsɛv ən ti ɪθ /

adjective

1. next after the sixty-ninth; being the ordinal number for 70.

2. being one of 70 equal parts.

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noun

1. a seventieth part, especially of one (1/70).

2. the seventieth member of a series.

seventieth British  

/ ˈsɛvəntɪɪθ /

adjective

1. (usually prenominal)

   1. being the ordinal number of seventy in numbering or counting order, position, time, etc: often written 70th

   2. ( as noun )

      the seventieth in line

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noun

1. 1. one of 70 approximately equal parts of something

   2. ( as modifier )

      a seventieth part

2. the fraction equal to one divided by 70 ( 1/ 70 )

Etymology

Origin of seventieth

First recorded in 1250–1300, seventieth is from the Middle English word seventithe. See seventy, -eth ²

Example Sentences

Because, as chance would have it, my mother-in-law requested a cruise through Alaska for her seventieth birthday this summer.

From Salon • Jul. 4, 2025

The letter expresses the Queen Elizabeth II's "grateful thanks" for Charlie's "kind message on the occasion of the seventieth anniversary of my accession to the throne".

From BBC • Sep. 17, 2022

The occasion marked the seventieth anniversary of the Universal Declaration of Human Rights, and five “ambassadors” from the program joined Craig Mokhiber, the director of the New York office of the U.N.

From The New Yorker • Jul. 8, 2019

On 26 August 2016, the club made an announcement – “beautifully timed in our seventieth anniversary” – that the game was up for good.

From The Guardian • Sep. 26, 2017

But now his seventieth birthday was coming up, and he had agreed to have the celebration at Sofía's house.

From "How the García Girls Lost Their Accents" by Julia Alvarez