Superlative form of well-selling: most well-selling.(adjective)
In marketing, highly popular with consumers purchasing goods within a specific class.(adjective)
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Use "best-selling" in a sentence
"Companies reporting Before the Market Open on Tuesday, December 13 Earnings Preview: Best Buy guides FY12 EPS $3.35-$3.65, revenue $51B-$52.5B U.S. online holiday spending approaches $25B for season, up 15% Amazon.com's tablet outselling iPad at Best Buy, Cnet reports Amazon's (AMZN) Kindle Fire tablet is identified as the best-selling tablet on Best Buy's website, beating out Apple's (AAPL) iPad, according to Cnet."
"When 2011 ended, the Civic had retained the title of best-selling passenger car in Canada."
"The battle for the title of best-selling passenger car in Canada is the fiercest it has been in more than a decade as"