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English definition of “bestseller”

bestseller

noun [C]     /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 ).Kinds of books best-selling     adjective [before noun] She's a best-selling author (= an author whose books are very popular ).Kinds of books
(Definition of bestseller noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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