quadrillion

noun

qua·​dril·​lion kwä-ˈdril-yən 

US : a number equal to 1 followed by 15 zeros see Table of Numbers

also, British : a number equal to 1 followed by 24 zeros see Table of Numbers

quadrillion adjective

quadrillionth

kwä-ˈdril-yən(t)th 

adjective or noun

Examples of quadrillion in a Sentence

Recent Examples on the Web

Hard Science Einstein’s theory of general relativity passes another test, with implications for dark matter and dark energy The theory is accurate within at least one part in a quadrillion. —Big Think, 24 June 2024

Also, a single vacation on Expedia involves 1.26 quadrillion possible variable combinations, such as hotel locations and price ranges. —Kara Peeler, Sunset Magazine, 2 May 2024

The broods will emerge peacefully, but Cooley said hundreds of trillions – or even quadrillions – of cicadas are expected. —Caitlin O'Kane, CBS News, 8 Apr. 2024

An expert testified earlier that the odds of someone matching the blood type found to be Holton’s inside the apartment was 2.7 quadrillion to one. —Charles Rabin, Miami Herald, 1 Apr. 2024

Word History

Etymology

French, from Middle French, from quadri- + -illion (as in million)

First Known Use

circa 1690, in the meaning defined above

Kids Definition

quadrillion

noun

qua·​dril·​lion kwä-ˈdril-yən 

US : a number equal to 1 followed by 15 zeros see number

also, British : a number equal to 1 followed by 24 zeros see number