(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
But she said a "eureka moment" came soon after getting her own bank account, when she went out and bought herself a coffee.
From BBC ● May 19, 2026
This is the passage that zapped Ms. Prose with her eureka moment.
From The Wall Street Journal ● May 1, 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
Old rail lines run through historic downtown Eureka.
From Los Angeles Times ● Oct. 19, 2026
Mountain Blue, which owns the rights to Eureka Sunrise and other top varieties, began offering access to other companies in China beyond Driscoll’s.
From The Wall Street Journal ● Sep. 15, 2026
This is the second hijacking of a vessel off the coast of Yemen since May, when the MT Eureka was seized near the port of Qana.
From BBC ● Jul. 17, 2026
More recently, he founded an AI education company called Eureka Labs External link.
From Barron's ● May 19, 2026
And yes, again the Eureka washed over him, the yes-yes-yes of it.
From "An Abundance of Katherines" by John Green
What was a Eureka! moment in your life — in France, in Denmark, or in La Paz?
From Salon ● May 4, 2019
But the theory was not born, fully formed, in some Eureka! moment.
From Scientific American ● Nov. 12, 2015
I can’t remember any Eureka! moment, but it seems it must’ve emerged slowly from the cesspool of my imagination.
From Forbes ● Sep. 24, 2014
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
"Eureka! ain't we the handy boys, though, to get on the track of the kidnappers so quick?" exclaimed Bristles, proudly.
From Fred Fenton on the Track or, The Athletes of Riverport School by Allen Chapman
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
