Definition of “bestseller” - English Dictionary

“bestseller” in British English

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bestsellernoun [ C ]

uk /ˌbestˈsel.ər/ us /ˌbestˈsel.ɚ/
best-selling
adjective [ before noun ] uk /ˌbestˈsel.ɪŋ/ us /ˌbestˈsel.ɪŋ/

She's a best-selling author (= an author whose books are very popular).

(Definition of “bestseller” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“bestseller” in Business English

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bestsellernoun [ C ]

also best-seller uk /ˌbestˈselər/ us COMMERCE

a product that is extremely popular and has sold in very large numbers:

J K Rowling’s ‘Harry Potter’ novels are all bestsellers.
His bagless vacuum cleaner soon became a bestseller.

(Definition of “bestseller” from the Cambridge Business English Dictionary © Cambridge University Press)