(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.
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
The results were no eureka moment for luxury and might lead to caution prevailing among investors, Jefferies analysts wrote in a note to clients.
From The Wall Street Journal ● Jan. 28, 2026
He has supported people in the community "four, five, six times before you get that eureka moment and you don't see them again."
From BBC ● Dec. 10, 2025
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
On its website, Cursor cites endorsements from leaders at Stripe, OpenAI and Eureka Labs.
From MarketWatch ● Apr. 21, 2026
Humboldt Bay and the neighboring town of Eureka are home to aquaculture businesses, fisheries, environmental justice organizations, local tribes and many other residents and stakeholders whose opinions on the project differ.
From Los Angeles Times ● Apr. 9, 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
And yes, again the Eureka washed over him, the yes-yes-yes of it.
From "An Abundance of Katherines" by John Green
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
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
The Eureka! is a small four story townhouse with only 16 rooms that overlooked the Amstel, the largest canal in Amsterdam, similar to the Grand Canal in Venice.
From Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel by Schwartau, Winn
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.
