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English definition of “breakthrough”

breakthrough

noun [C] uk   /ˈbreɪk.θruː/ us  
B2 an important discovery or event that helps to improve a situation or provide an answer to a problem: Scientists are hoping for a breakthrough in the search for a cure for cancer. A major breakthrough in negotiations has been achieved.
(Definition of breakthrough from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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