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English definition of “rider”

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rider

noun [C]
 
 
/ˈraɪdər/
LAW, INSURANCE an addition to an official or legal document: You'll need a rider or extra insurance for high-end items such as jewelry, computers, and artwork. The Senate had to accept the rider to the bill that Gorton had crafted with mining industry lobbyists. →  See also dispatch rider , free rider
(Definition of rider from the Cambridge Business English Dictionary © Cambridge University Press)
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