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

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

What if you told him that, even in his moment, Exxon's scientists already understood with remarkable accuracy what was going to happen to us in the distinctly overheating twenty-first century?

From Salon • Feb. 23, 2023

For home cooks baking up pecan pie well into the twenty-first century, Karo is still pretty much the only brand you can buy in grocery stores: It has kept that corporate hold.

From Slate • Nov. 24, 2022

“Here it is, the one with your notation. Number 437, on the twenty-first of July. I wonder where we put it?”

From "The Evolution of Calpurnia Tate" by Jacqueline Kelly