quintillion
noun
quin·til·lion kwin-ˈtil-yən 
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
quintillion adjective
quintillionth
kwin-ˈtil-yən(t)th
adjective or noun 
Example Sentences
Recent Examples on the Web Moore’s law has taken us from 250 billion or so CPU churns per year on the earliest Macs to a quintillion potential clock cycles on a good gaming PC, a healthy 4,000,000X increase. 
WIRED, 16 Sep. 2022 Under most circumstances, researchers would need to subject an object to ludicrous accelerations—upward of 25 quintillion times the force of Earth’s gravity—in order to produce a measurable emission. Joanna Thompson, Scientific American, 20 May 2022 Chief designer Dave Battista, who is working individually with each buyer to spec their Battistas, says the exterior can be configured in up to 13.9 quintillion configurations. Basem Wasef, Car and Driver, 13 July 2022 According to SeedScientific, people were generating 2.5 quintillion bytes of data per day just a few years ago, including more than 300 million uploaded photos per day and 510,000 comments posted every minute to Facebook. Pranav Desai, Forbes, 16 May 2022 The odds of randomly picking a perfect bracket are pretty remote, like 2^63, or about 1 in 9.2 quintillion. Leon Labrecque, Forbes, 17 Mar. 2022 That total may sound like a lot, but Psyche actually tails behind Davida, which is valued at an estimated $27 quintillion, reported Business Insider in June 2021. Elizabeth Gamillo, Smithsonian Magazine, 4 Jan. 2022 With many millions of insect species (only about a million of which have been named) and 10 quintillion individuals, the world is literally crawling and buzzing with possibilities. Greg Miller, Smithsonian Magazine, 23 Dec. 2021 According to the release, DNA testing showed the samples were 25 quintillion times more likely to have come from Hoff than the general population, police said. NBC News, 20 Nov. 2021 See More
WIRED, 16 Sep. 2022 Under most circumstances, researchers would need to subject an object to ludicrous accelerations—upward of 25 quintillion times the force of Earth’s gravity—in order to produce a measurable emission. Joanna Thompson, Scientific American, 20 May 2022 Chief designer Dave Battista, who is working individually with each buyer to spec their Battistas, says the exterior can be configured in up to 13.9 quintillion configurations. Basem Wasef, Car and Driver, 13 July 2022 According to SeedScientific, people were generating 2.5 quintillion bytes of data per day just a few years ago, including more than 300 million uploaded photos per day and 510,000 comments posted every minute to Facebook. Pranav Desai, Forbes, 16 May 2022 The odds of randomly picking a perfect bracket are pretty remote, like 2^63, or about 1 in 9.2 quintillion. Leon Labrecque, Forbes, 17 Mar. 2022 That total may sound like a lot, but Psyche actually tails behind Davida, which is valued at an estimated $27 quintillion, reported Business Insider in June 2021. Elizabeth Gamillo, Smithsonian Magazine, 4 Jan. 2022 With many millions of insect species (only about a million of which have been named) and 10 quintillion individuals, the world is literally crawling and buzzing with possibilities. Greg Miller, Smithsonian Magazine, 23 Dec. 2021 According to the release, DNA testing showed the samples were 25 quintillion times more likely to have come from Hoff than the general population, police said. NBC News, 20 Nov. 2021 See More Word History
Etymology
Latin quintus + English -illion (as in million)
First Known Use
circa 1690, in the meaning defined above