Definition of autocross noun from the Oxford Advanced Learner's Dictionary

 

autocross

 noun
noun
BrE BrE//ˈɔːtəʊkrɒs//
 
; NAmE NAmE//ˈɔːtoʊkrɔːs//
 
, NAmE//ˈɔːtoʊkrɑːs//
 
[uncountable]
 
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a form of motor racing in which cars are driven over rough ground compare rallycross Word Origin 1960s: blend of automobile and cross-country.
See the Oxford Advanced American Dictionary entry: autocross