Definition of breakthrough adjective from the Oxford Advanced American Dictionary

 

breakthrough

 adjective
adjective
NAmE//ˈbreɪkθru//
 
[only before noun]
 
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in which a performer or type of product is successful for the first time, when it is likely to be even more successful in the future It was a breakthrough album for the band. breakthrough technology/products an award for the best breakthrough band The emphasis is on developing breakthrough technology that will lead to new business.
See the Oxford Advanced Learner's Dictionary entry: breakthrough

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