rider

noun

1. A knight, or other mounted warrior.
2. An old Dutch gold coin with the figure of a man on horseback stamped upon it.
3. Someone who rides a horse or (later) a bicycle, motorcycle etc.
4. A motorcycle enthusiast; a motorcycle club member.
5. A mounted robber; a bandit, especially in the Scottish borders.
6. Someone who breaks in or manages a horse; a riding master.
7. An agent who goes out with samples of goods to obtain orders; a commercial traveller or travelling salesman.
8. Someone riding in a vehicle; a passenger on public transport.
9. A skateboarder
10. A snowboarder
11. A supplementary clause added to a document after drafting, especially to a bill under the consideration of a legislature.
12. An amendment or addition to an entertainer's performance contract, often covering a performer's equipment or food, drinks, and general comfort requirements.
13. An additional matter or question arising in corollary; a qualification.
14. A supplementary question, now especially in mathematics.
15. An add-on to an insurance policy.
16. An interior rib occasionally fixed in a ship's hold, reaching from the keelson to the beams of the lower deck, to strengthen the frame.
17. Rock material in a vein of ore, dividing it.
18. The second tier of casks in a vessel's hold.
19. A small, sliding piece of thin metal on a balance, used to determine small weights.
20. The first Lenormand card, also known as either the horseman or the cavalier.