Definition of eureka moment
: a moment of sudden, triumphant discovery, inspiration, or insight … he would later tell, over and over, the story of how the idea for the collection came to him—the Eureka moment—improving it with each rendition. — Donald Dale Jackson, Smithsonian, October 1988 Then one day, listening to a Communist fulminator in Pioneer Square, he'd had a eureka moment in which he realized that the way to get ahead in his new country was to exploit some labor himself. — Jonathan Franzen, Freedom, 2010
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