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English definition of “bestseller”

bestseller

noun [C] (also best-seller)     /ˌbestˈselər/ COMMERCE
a product that is extremely popular and has sold in very large numbers : J K Rowling’s ‘ Harry Potternovels are all bestsellers. His bagless vacuum cleaner soon became a bestseller.
(Definition of bestseller noun from the Cambridge Business English Dictionary © Cambridge University Press)
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