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
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
- in progress
- in proportion
- in proportion to
- in propria persona
- in prospect
- in public
- in pursuance of
- in pursuit of
- in quantity
- in querpo
- in quest of
- in question
- in quick succession
- in quotes
- in rapid succession
- in re
- in reach
- in reaction to
- in readiness
- in real life
- in reality
- in reason
- in record numbers
- in record time
- in reference to