A person who rides a horse, bicycle, motorcycle, or other vehicle. The rider expertly maneuvered the motorcycle through the winding roads.
An addition or amendment to a document, especially a legislative bill or insurance policy. The senator added a rider to the bill to include funding for education.
A clause appended to a contract or agreement, often specifying additional terms. The contract included a rider that detailed the artist's specific requirements for the performance.
A subsidiary proposition or problem that follows from a previous theorem, especially in geometry. The final question in the geometry exam was a tricky rider based on Pythagoras' theorem.
A small weight placed on a balance scale's arm to make precise adjustments to the measured mass. The pharmacist slid a 5-gram rider along the beam to obtain an exact measurement.
A person who travels as a passenger in a vehicle, especially one who regularly uses public transportation. Weekday riders on the city bus system will receive a discount starting next month.