quin·​til·​lion | \ kwin-ˈtil-yən How to pronounce quintillion (audio) \

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

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Other Words from quintillion

quintillion adjective
quintillionth \ kwin-​ˈtil-​yən(t)th How to pronounce quintillion (audio) \ adjective or noun

Examples of quintillion in a Sentence

Recent Examples on the Web There might be a quintillion planets theoretically hospitable to life, but if the odds of any planet having life are 10-quintillion-to-1 against, there would be only a 10 percent chance of our not being alone. New York Times, "Letters to the Editor," 18 Sep. 2020 Astrophysicist Christopher Conselice of the University of Nottingham puts the number at 100 quintillion. Rob Verger, Popular Science, "Are we alone in the universe? Probably not.," 1 Oct. 2019 The story of a guy who wouldn't let a few quintillion possible decryption keys stand between him and his cryptocurrency. Lily Hay Newman, Wired, "The Quest to Liberate $300K of Bitcoin From an Old ZIP File," 6 Aug. 2020 But several exaflop computers, which will exceed one quintillion operations per second, are already under construction that rely on chips from AMD and Intel. Aaron Pressman, Fortune, "The top tech stock during the pandemic isn’t the one you think it is," 23 June 2020 Mathematicians have tested quintillions of examples (that’s 18 zeros) without finding a single exception to Collatz’s prediction. Quanta Magazine, "Mathematician Proves Huge Result on ‘Dangerous’ Problem," 11 Dec. 2019 The facilities paused normal operations and delayed other research to allow the global telescope to come alive in search of radio waves from a ring of light encircling the shadow of a black hole more than 300 quintillion miles away. Adam Glanzman, Smithsonian, "Meet the Global Team That Captured the First Image of a Black Hole," 19 Nov. 2019 The analyst testified the chances of the blood not being Prothro’s were astronomical, one in several quintillion. Annie Sciacca, The Mercury News, "East Bay man settles double-murder charges, bloody dreadlocks sealed the case," 9 Sep. 2019 More than a million recognized insect species and some 10 quintillion (that’s the number 1 followed by 18 zeros) bugs buzz, hiss, and fly around the planet. Jani Actman, National Geographic, "Bug smuggling is big business," 5 Sep. 2019

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.

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First Known Use of quintillion

circa 1690, in the meaning defined above

History and Etymology for quintillion

Latin quintus + English -illion (as in million)

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Time Traveler for quintillion

Time Traveler

The first known use of quintillion was circa 1690

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Statistics for quintillion

Cite this Entry

“Quintillion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quintillion. Accessed 6 Mar. 2021.

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More from Merriam-Webster on quintillion

Nglish: Translation of quintillion for Spanish Speakers

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