septillion

noun

sep·​til·​lion sep-ˈtil-yən 

often attributive

US : a number equal to 1 followed by 24 zeros see Table of Numbers

also, British : a number equal to 1 followed by 42 zeros see Table of Numbers

Example Sentences

Recent Examples on the Web

Authorities say the match Parabon Labs identified had a 1 in 65 septillion odds of being inaccurate. —Grace Kahng, ABC News, 16 Sep. 2021

By comparison, the pressure inside a neutron star is in the septillions of gigapascals, so these liquid cases likely occur in nature around the universe. —Caroline Delbert, Popular Mechanics, 9 Dec. 2019

The number of possible routes adds up to around 15 septillion (trillion trillion), according to Goldman Sachs, an investment bank. —The Economist, 28 Mar. 2018

Word History

Etymology

French, from Latin septem + French -illion (as in million) — more at seven

First Known Use

1690, in the meaning defined above

Kids Definition

septillion

noun

sep·​til·​lion sep-ˈtil-yən 

US : a number equal to 1 followed by 24 zeros see number

also, British : a number equal to 1 followed by 42 zeros see number