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 monarch noted the privilege inherent in any mother living long enough to propose a toast to her son on his seventieth.

From The New Yorker • Nov. 19, 2018

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

“It truly is, Jojo,” Stella assured her brother for the seventieth time.

From "Stella by Starlight" by Sharon M. Draper