rider Meaning, Definition & Usage

noun a traveler who actively rides an animal (as a horse or camel)
noun a clause that is appended to a legislative bill
noun a traveler who actively rides a vehicle (as a bicycle or motorcycle)
noun a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
passenger.

One who, or that which, rides.
Formerly, an agent who went out with samples of goods to obtain orders; a commercial traveler. Eng.
One who breaks or manages a horse. Shak.
An addition or amendment to a manuscript or other document, which is attached on a separate piece of paper; in legislative practice, an additional clause annexed to a bill while in course of passage; something extra or burdensome that is imposed.
After the third reading, a foolish man stood up to propose a rider. Macaulay.

This [question] was a rider which Mab found difficult to answer. A. S. Hardy.
(Math.) A problem of more than usual difficulty added to another on an examination paper.
D. rijder. A Dutch gold coin having the figure of a man on horseback stamped upon it.
His moldy money ! half a dozen riders. J. Fletcher.
(Mining) Rock material in a vein of ore, dividing it.
(Shipbuilding) An interior rib occasionally fixed in a ship's hold, reaching from the keelson to the beame of the lower deck, to strengthen her frame. Totten.
(Naut.) The second tier of casks in a vessel's hold.
A small forked weight which straddles the beam of a balance, along which it can be moved in the manner of the weight on a steelyard.
A robber. Obs. or Prov. Eng. Drummond.