Definition of rider:
- A Dutch gold coin having the figure of a man on horseback stamped upon it.
- A problem of more than usual difficulty added to another on an examination paper.
- A robber.
- 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.
- 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.
- An interior rib occasionally fixed in a ship's hold, reaching from the keelson to the beams of the lower deck, to strengthen her frame.
- Formerly, an agent who went out with samples of goods to obtain orders; a commercial traveler.
- One who breaks or manages a horse.
- One who, or that which, rides.
- Rock material in a vein of ore, dividing it.
- The second tier of casks in a vessel's hold.
In a letter published in the American Journal of Philately, July 20th, 1869, W. H. H. Corell, 3rd Assistant Postmaster General, says: " The records of the Department do not contain any reference to the other stamp, Post Rider."- "History of the Postage Stamps of the United States of America", John Kerr Tiffany.
- "The Galaxy Primes", Edward Elmer Smith.
- "The Best of the World's Classics, Restricted to prose. Volume I (of X) - Greece", Various.