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 quadrillion (audio) \ adjective or noun

Examples of quadrillion in a Sentence

Recent Examples on the Web Some researchers estimate that there are 17 quadrillion flies on the planet. Howard Schneider, WSJ, 28 May 2021 As of May 10, the total supply of Shiba Inu was one quadrillion, according to the cryptocurrency exchange Binance. Paul Vigna, WSJ, 13 May 2021 There are approximately 10 quadrillion connections between neurons — that is a ‘1’ followed by 16 zeros. Gabriel A. Silva, Forbes, 19 Apr. 2021 And every one of these billions and billions and billions of action potentials and postsynaptic potentials across the 10 quadrillion synapses connecting the neurons in the human brain are all taking place independent of each other. Gabriel A. Silva, Forbes, 19 Apr. 2021 And, sure—[math, math, math]—maybe the odds that an early lead for Trump would have been flipped upside-down are very small, like one-in-a-quadrillion small. Benjamin Mazer, Wired, 11 Dec. 2020 Cicchetti’s p-value of one in a quadrillion puts us all to shame. Benjamin Mazer, Wired, 11 Dec. 2020 The chance of winning all four, per the suit, was less than one in a quadrillion to the fourth power. The Editors, National Review, 11 Dec. 2020 Claims about this 1 in a quadrillion chance spread widely on Facebook after the Dec. 8 lawsuit. Eric Litke, USA TODAY, 11 Dec. 2020

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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Time Traveler for quadrillion

Time Traveler

The first known use of quadrillion was circa 1690

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Statistics for quadrillion

Last Updated

14 Jun 2021

Cite this Entry

“Quadrillion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quadrillion. Accessed 19 Jun. 2021.

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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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