eureka
interj. C1 Advanced US //jʊˈɹikə// UK //juːɹˈiːkɐ// eu·re·ka
interj. a word you shout when you suddenly find the answer to a problem or make a great discovery.
interj. an exclamation used to celebrate a sudden discovery or the successful solution to a problem. Derived from the Greek for 'I have found it'.
Eureka! I finally found my lost keys.
After hours of staring at the complex math problem, she shouted 'Eureka!' as the solution became clear.
The scientist experienced a true eureka moment when the results of the final experiment confirmed his long-standing hypothesis about cellular regeneration.
Usage
Often used as a standalone exclamation or to modify the noun 'moment'.