(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.
“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
This is a eureka moment for astronomers as they just found a new way to track Venusian weather over the past decade - the longest duration of observation ever.
From Space Scoop ● Jul. 8, 2025
Penelope felt as if a eureka were brewing someplace inside her, if only she could put all the pieces together.
From "The Interrupted Tale" by Maryrose Wood
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
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
For the man behind the pouch technology, his own Eureka moment similarly came at a music festival back in 2012.
From BBC ● Jan. 24, 2026
On August 10, shortly before meeting Jan Burres and Bob, McCandless had been ticketed for hitchhiking near Willow Creek, in the gold-mining country east of Eureka.
From "Into the Wild" by Jon Krakauer
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
We’ve concocted this image for ourselves of inspiration being a sudden Eureka! moment, with a lightbulb appearing over our heads.
From Forbes ● May 30, 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
Even when you hold up your treasure, and cry "Eureka!" your shrewd opponent will coolly say that you have given a false interpretation, and have drawn wrong conclusions,—that his masters never claimed such an absurdity.
From History of Rationalism Embracing a Survey of the Present State of Protestant Theology by Hurst, J. F. (John Fletcher)
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.
