(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.
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
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
"It's one of those eureka moments that you think 'nature is trying to tell us something here.'"
From Science Daily • Oct. 16, 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
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.
