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

rider

noun
 
/ˈraɪdə(r)/
 
/ˈraɪdər/
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  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 also boundary rider, dispatch riderTopics Transport by car or lorryb1, Sports: other sportsb1
  2. rider (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 Originlate Old English rīdere ‘mounted warrior, knight’ (see ride, -er).
See rider in the Oxford Advanced American Dictionary
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