Definition of rider noun from the Oxford Advanced American Dictionary

      

    rider

     noun
    noun
    NAmE//ˈraɪdər//
     
     
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  1. 1 a person who rides a horse, bicycle, motorcycle, or snowboard Three riders (= people riding horses) were approaching. horses and their riders She's an experienced rider. The road was full of joggers and bike riders.
  2. 2rider (to something) an extra piece of information that is added to an official document
See the Oxford Advanced Learner's Dictionary entry: rider