Meaning of “best-seller” in the English Dictionary

"best-seller" in American English

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best-sellernoun [ C ]

also bestseller us /ˈbestˈsel·ər/

a new book or other product that has sold a great number of copies

adjective [ not gradable ] also bestselling us /ˈbestˈsel·ɪŋ/

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)