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

Which brings us to "Look Up," his twenty-first studio album and easily his finest record in decades.

From Salon • Jan. 10, 2025

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

The most recent challenge to world health, the COVID-19 pandemic that began in December 2019, demonstrates how both globalization and technological developments affect life in the twenty-first century.

From Textbooks • Dec. 14, 2022

Neutron stars would not be detected until 1967 and hard evidence of black holes not found until the twenty-first century, underscoring Oppenheimer’s achievement and the tragedy of his curiously unfulfilled career.

From "Big Science" by Michael Hiltzik