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

      

    rider

     noun
    noun
    BrE BrE//ˈraɪdə(r)//
     
    ; NAmE NAmE//ˈraɪdər//
     
    People in motoring, Equine sports
     
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  1. 1  a person who rides a horse, bicycle or motorcycle Three riders (= people riding horses) were approaching. horses and their riders She's an experienced rider. a motorcycle dispatch rider See related entries: People in motoring, Equine sports
  2. 2rider (to something) an extra piece of information that is added to an official document He finally agreed to a divorce with the rider that she could not remarry. He later added a number of riders to this hypothesis.
  3. Word Origin late Old English rīdere ‘mounted warrior, knight’ (see ride, -er).
See the Oxford Advanced American Dictionary entry: rider