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English definition of “bestseller”

bestseller

noun [C] uk   /ˌbestˈsel.ər/ us    //
B2 a product that is extremely popular and has sold in very large numbers: The "Harry Potter" novels were all bestsellers. His latest book has gone to number two in the bestseller list (= the list of the most popular books).
best-selling
adjective [before noun] uk   us  
She's a best-selling author (= an author whose books are very popular).
(Definition of bestseller from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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