Rider

1. n. A robber.
2. n. One who, or that which, rides.
3. n. Formerly, an agent who went out with samples of goods to obtain orders; a commercial traveler.
4. n. One who breaks or manages a horse.
5. n. 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.
6. n. A problem of more than usual difficulty added to another on an examination paper.
7. n. A Dutch gold coin having the figure of a man on horseback stamped upon it.
8. n. Rock material in a vein of ore, dividing it.
9. n. 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.
10. n. The second tier of casks in a vessel’s hold.
11. 1n. 1 A robber.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.