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authentication
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authenticity
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auto racing
au·to rac·ing


noun 
Definition:
 
U.S. racing in fast cars: racing in motor vehicles, especially in cars that are specially designed to travel at high speeds.
Canadian term  motor racing
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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