Meaning of “rider” in the English Dictionary

"rider" in British English

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ridernoun [ C ]

uk /ˈraɪ.dər/ us /ˈraɪ.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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rider" in American English

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ridernoun [ C ]

us /ˈrɑɪ·dər/

a person in a vehicle, or on an animal, bicycle, etc.

(Definition of “rider” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"rider" in Business English

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ridernoun [ C ]

uk /ˈraɪdər/ us

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.

(Definition of “rider” from the Cambridge Business English Dictionary © Cambridge University Press)