qua·​dril·​lion | \ kwä-ˈdril-yən How to pronounce quadrillion (audio) \

Definition of quadrillion

US : a number equal to 1 followed by 15 zeros — see Table of Numbers also, British : a number equal to 1 followed by 24 zeros — see Table of Numbers

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Other Words from quadrillion

quadrillion adjective
quadrillionth \ kwä-​ˈdril-​yən(t)th How to pronounce quadrillionth (audio) \ adjective or noun

Examples of quadrillion in a Sentence

Recent Examples on the Web

The bulk of Japan’s ¥1.83 quadrillion in household financial assets is held in post offices or bank accounts that pay zero interest. The Economist, "Japanese people need to put more aside for retirement," 4 July 2019 Booker found this odd trio of 16-digit integers by devising a new search algorithm to sift them out of quadrillions of possibilities. Quanta Magazine, "Sum-of-Three-Cubes Problem Solved for ‘Stubborn’ Number 33," 26 Mar. 2019 The core itself is 1 quadrillion to 1 sextillion kilograms, which is a little lighter than Mercury. John Wenz, Popular Mechanics, "Scientists Think They've Found a Dead Planetary Core Orbiting a Dead Star," 4 Apr. 2019 Last month, scientists showed that there are likely quadrillions of diamonds below the Earth's surface. David Grossman, Popular Mechanics, "The Hope Diamond Formed At The Bottom of The Ocean," 2 Aug. 2018 But the odds aren’t especially favorable, at about 1 in 88 quadrillion (that’s 88,000,000,000,000,000). Scott Mcfetridge, The Seattle Times, "Mega Millions, Powerball prizes come down to math, long odds," 23 Oct. 2018 In all, interbank payments systems in the U.S. handled transactions totaling over $1 quadrillion in 2016, according to a recent Treasury Department report. Lalita Clozel, WSJ, "Federal Reserve Floats Proposal to Modernize Its Payments System," 3 Oct. 2018 The other three quarters are cars and trucks using gasoline, factories using quadrillions of British thermal units to forge metals and refine petroleum, and buildings heated by gas or propane. Nathanael Johnson, WIRED, "Where Can Climate Activists Find Common Ground?," 9 July 2018 But literally quadrillions of proton collisions in the collider later, nothing new has emerged. Jason Daley, Smithsonian, "Researchers Find More Evidence for the Higgs Boson," 10 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'quadrillion.' 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 quadrillion

circa 1690, in the meaning defined above

History and Etymology for quadrillion

French, from Middle French, from quadri- + -illion (as in million)

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Statistics for quadrillion

Last Updated

10 Jul 2019

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Time Traveler for quadrillion

The first known use of quadrillion was circa 1690

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More Definitions for quadrillion



English Language Learners Definition of quadrillion

: the number 1,000,000,000,000,000 : one thousand trillion

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Rhyming Dictionary: Words that rhyme with quadrillion

Comments on quadrillion

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


to complain fretfully

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