Definition of NASCAR from the Oxford Advanced Learner's Dictionary

 

NASCAR

 
BrE
 
; NAmE
 
the National Association for Stock Car Auto Racing
 
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the US organization for the sport of racing stock cars (= ordinary cars fitted with especially powerful engines). It was established in 1948 at Daytona Beach, Florida. The Daytona 500 is the most famous of its races.
See the Oxford Advanced American Dictionary entry: NASCAR