twenty-first

American  

[twen-tee-furst, twuhn-] / ˈtwɛn tiˈfɜrst, ˈtwʌn- /

adjective

1. next after the twentieth; being the ordinal number for 21.

2. being one of 21 equal parts.

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noun

1. a twenty-first part, especially of one (1/21).

2. the twenty-first member of a series.

Example Sentences

At half past six on the twenty-first of June 1922, when Count Alexander Ilyich Rostov was escorted through the gates of the Kremlin onto Red Square, it was glorious and cool.

From Los Angeles Times • May 29, 2024

"We find that rapid ocean warming, at approximately triple the historical rate, is likely committed over the twenty-first century, with widespread increases in ice-shelf melting, including in regions crucial for ice-sheet stability," the authors write.

From Salon • Oct. 25, 2023

Unimpressed by the books she found in her search for answers, MacPhail, a medical anthropologist, began writing Allergic as a “personal and scientific journey to diagnose the problem of allergy in the twenty-first century.”

From Scientific American • May 31, 2023

Increasingly, in the twentieth and twenty-first centuries, climate change has also made nomadic life more difficult.

From Textbooks • Apr. 19, 2023

The Mayans would never have argued about whether 2000 or 2001 was the first year in the twenty-first century.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife