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English definition of “rider”

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rider

noun [C] uk   /ˈraɪ.dər/ us    /-dɚ/

rider noun [C] (ON HORSE/BICYCLE)

B1 a person who travels along on a horse or bicycle: One of the riders was thrown off his horse.
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rider noun [C] (EXTRA STATEMENT)

formal a statement that is added to what has already been said or decided, or an addition to a government bill (= a written plan for a law): I should like to add a rider to the judgment of the court.
(Definition of rider from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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