(initial capital letter) I have found (it): the reputed exclamation of Archimedes when, after long study, he discovered a method of detecting the amount of alloy mixed with the gold in the crown of the king of Syracuse.
(used as an exclamation of triumph at a discovery.)
1560–70; < Greek heúrēka, 1st person singular perfect indicative of heurískein to find, discover
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
His eureka moment came nearly four years ago, when ChatGPT was made available to the public on Nov. 30, 2022.
From MarketWatch ● Aug. 20, 2026
“We’ve heard of ‘eureka’ and, yes, there was this eureka moment,” he recalled.
From Los Angeles Times ● Jul. 17, 2026
That was a eureka moment and one that I carried with me for the rest of my life.
From The Wall Street Journal ● May 7, 2026
I think my first eureka moment was when I was traveling in sub-Saharan Africa on the Ivory Coast doing a site visit.
From Barron's ● Mar. 5, 2026
Hudson leans in, puts his fist underneath his chin, and stares off into the sky like he’s just had the most epic eureka moment and is now ready to remake the world.
From "What If It's Us" by Becky Albertalli and Adam Silvera
More recently, he founded an AI education company called Eureka Labs External link.
From Barron's ● May 19, 2026
He later returned to OpenAI for a short stint and then launched an AI education startup called Eureka Labs.
From MarketWatch ● May 19, 2026
The Yemeni coastguard earlier said the tanker MT Eureka had been hijacked and was headed towards Somalia.
From BBC ● May 2, 2026
Other A-Street investments include Great Minds, a curriculum provider behind such programs as Eureka Math; youth mental health startup Cartwheel Care; and AI-powered early reading platform LitLab.
From The Wall Street Journal ● Apr. 8, 2026
Nevertheless, no ancient Greek struck a medal with the word Eureka on it and started awarding it to successful scientists as we award the Fields Medal to successful mathematicians.
From "The Invention of Science" by David Wootton
Most scientists dream of having a "Eureka!" moment — that precious instant when you realize you have discovered something new, wonderful and significant.
From Salon ● Jul. 8, 2021
But the theory was not born, fully formed, in some Eureka! moment.
From Scientific American ● Nov. 12, 2015
But at Eureka! we think we've done just that: our play-based approach with its emphasis on immersive, tactile and themed experiences has never been more popular, as evidenced by our steadily increasing visitor numbers.
From The Guardian ● Jun. 27, 2013
But when you're writing your ideas down, Jantsch explains, simply collecting those ideas and looking for connections can help you speed up the "Eureka!" process.
From Inc ● May 22, 2013
One day he rushed naked from the bath, exclaiming, "Eureka!" and the presumption is that he was right.
From Lippincott's Magazine, Volume 11, No. 26, May, 1873 by Various
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
