Used to express triumph upon finding or discovering something.(interjection)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "eureka" in a sentence
"BLOODSWORTH: Well, I had what they call a eureka moment at that time."
"Interviewed at his office in Madison, Halzen said he's forgotten his "eureka" moment back in 1987."
"I never experienced a "eureka" moment, but various experiences and impressions began to flow together, like tributary streams into a river, and I started writing."