quin·​til·​lion | \kwin-ˈtil-yən \

Definition of quintillion 

US : a number equal to 1 followed by 18 zeros — see Table of Numbers also, British : a number equal to 1 followed by 30 zeros — see Table of Numbers

Keep scrolling for more

Other Words from quintillion

quintillion adjective
quintillionth \ kwin-​ˈtil-​yən(t)th \ adjective or noun

Examples of quintillion in a Sentence

Recent Examples on the Web

Your chances of filling out a perfect bracket are like 1 in 9.2 quintillion (yes, that's an actual number), so don't sweat it out too much. Cheryl Wray, AL.com, "March Madness 2018: How do I fill out NCAA basketball bracket?," 12 Mar. 2018 This is how the 1S-2S transition in hydrogen has been measured to 4 parts in a quintillion, about 1000 times more precise than the new antihydrogen result, Udem says. Adrian Cho, Science | AAAS, "Atoms and antiatoms haven’t crashed Albert Einstein’s theory of relativity—yet," 4 Apr. 2018 Odds of filling out a perfect bracket are 1 in 9.2 quintillion (9,000,000,000,000,000,000), according to a USA Today article. Karen Pilarski, Milwaukee Journal Sentinel, "Wauwatosa man keeps home after no one gets perfect NCAA bracket," 27 Mar. 2018 There is the painstaking work of taxonomists who continue to catalogue the earth's estimated 10 quintillion insects; the Greek island beekeepers; and the Zika-fighting mosquitoes in Brazil. Andrea Gawrylewski, Scientific American, "Bug Lovers, Earth’s Many Apocalypses, the Surprising Minds of Vegetative Patients and Other New Science Books," 1 July 2017 Your odds of filling out a perfect bracket are 1 in 9.2 quintillion (9,000,000,000,000,000,000), according to a USA Today article. Karen Pilarski, Milwaukee Journal Sentinel, "Do you have the perfect NCAA bracket? It might win you a $587,000 Wauwatosa home," 14 Mar. 2018 Suddenly, the odds of filling out a perfect bracket go from one in 9.2 quintillion to one in 5.74 billion. Tom Schad, USA TODAY, "NCAA tournament: How mathematicians use models to beat (or at least improve) the odds," 12 Mar. 2018 The gravitational era that begins around 15 trillion years from now could continue for quintillion years and beyond, Laughlin estimates. NBC News, "How humans might outlive Earth, the sun...and even the universe," 20 Dec. 2017 There is indeed quite a bit of it – about 7.5 quintillion grains on Earth’s beaches and deserts, according to one estimate. Eoin O'carroll, The Christian Science Monitor, "It's a small world after all, say scientists warning of sand scarcity," 14 Sep. 2017

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

See More

First Known Use of quintillion

circa 1690, in the meaning defined above

History and Etymology for quintillion

Latin quintus + English -illion (as in million)

Keep scrolling for more

Learn More about quintillion

Share quintillion

Dictionary Entries near quintillion








Statistics for quintillion

Look-up Popularity

Time Traveler for quintillion

The first known use of quintillion was circa 1690

See more words from the same year

Comments on quintillion

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


by force of circumstances

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
Spell It

Can you spell these 10 commonly misspelled words?


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


Love words? Need even more definitions?

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