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English definition of “best-seller”

best-seller

noun [C] (also bestseller)  /ˈbestˈsel·ər/ us  
a new book or other product that has sold a great number of copies
best-selling
adjective [not gradable] (also bestselling)  /ˈbestˈsel·ɪŋ/ us  
Released in February 2000, it is the best-selling computer game ever.
(Definition of best-seller from the Cambridge Academic Content Dictionary © Cambridge University Press)
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