Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Greek
Origin: heureka 'I have found', said by the Greek scientist Archimedes when he discovered a method of testing the purity of gold

eureka

 interjection
     
eu‧re‧ka humorous
used to show how happy you are that you have discovered the answer to a problem, found something etc
Definition from the Longman Dictionary of Contemporary English
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