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English definition of “breakthrough”

breakthrough

noun [C]     /ˈbreɪk.θruː/
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.Finding and discoveringTurning points and deciding moments
(Definition of breakthrough noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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