a book that is among those having the largest sales during a given period.
any product that among those of its kind is selling particularly well at a given time: This car was a bestseller last year.
Also, best seller.

1885–90, Americanism; best + seller

bestsellerdom, noun
best-selling, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bestseller (ˌbɛstˈsɛlə)
1.  a book, record, CD, or other product that has sold in great numbers, esp over a short period
2.  the author of one or more such books, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The book was a runaway bestseller the moment it appeared.
Not yet a bestseller, this song was well on its way last week.
Read something while you wait for that hot, new bestseller to come back in.
The novel, a fictionalized account composed from letters written home during the war, was her first bestseller.
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