Definition of aha moment noun from the Oxford Advanced Learner's Dictionary

 

aha moment

 noun
noun
BrE BrE//ɑːˈhɑː məʊmənt//
 
; NAmE NAmE//ɑːˈhɑː moʊmənt//
 
[usually singular]
 
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a moment where you suddenly understand something, realize something important, have a good idea, or find the answer to a problem After her aha moment three years ago, she began to spend more time with her family. I had an aha moment and suddenly knew what to do.