(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
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
It was those birds that had given him one of his eureka moments about natural selection.
From "Charles and Emma: The Darwins' Leap of Faith" by Deborah Heiligman
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
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
“I wanna have a Eureka moment,” he said, the way another kid might have expressed longing for a Teenage Mutant Ninja Turtle.
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
We have a thorough training programme for all of our staff at Eureka! and it pays off in the accolades we receive from our visitors in our feedback forms.
From The Guardian ● Jun. 27, 2013
I took it, on the spot, for a kind of "Eureka!" but without catching my friend's idea.
From The Sacred Fount by Henry James
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.
