septillion

noun, often attributive
sep·​til·​lion | \ sep-ˈtil-yən How to pronounce septillion (audio) \

Definition of septillion

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

Examples of septillion in a Sentence

Recent Examples on the Web

The number of possible routes adds up to around 15 septillion (trillion trillion), according to Goldman Sachs, an investment bank. The Economist, "In algorithms we trustHow AI is spreading throughout the supply chain," 28 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'septillion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of septillion

1690, in the meaning defined above

History and Etymology for septillion

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

Keep scrolling for more

Learn More about septillion

Dictionary Entries near septillion

septifragal

septile

Sept-Îles

septillion

septimal

septime

septimole

Statistics for septillion

Look-up Popularity

Time Traveler for septillion

The first known use of septillion was in 1690

See more words from the same year

More from Merriam-Webster on septillion

Rhyming Dictionary: Words that rhyme with septillion

Comments on septillion

What made you want to look up septillion? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

likely to have or produce good results

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!