rider

UK: /ˈraɪdə^r/ US: /ˈraɪdɚ/ ,(rī′dər)

WordReference Random House Learner's Dictionary of American English © 2025

rid•er /ˈraɪdɚ/   n. [countable]

1. a person who rides a horse, a bicycle, etc.
2. something that rides.
3. an additional statement added to a document, such as a lease.

WordReference Random House Unabridged Dictionary of American English © 2025

rid•er  (rī′dər), n. 

1. a person who rides a horse or other animal, a bicycle, etc.
2. something that rides.
3. Government an additional clause, usually unrelated to the main body, attached to a legislative bill in passing it.
4. an addition or amendment to a document, testament, etc.
5. any object or device that straddles, is mounted upon, or is attached to something else.
6. Building a rail or stake used to brace the corners in a snake fence.
7. Nautical, Naval Terms [Shipbuilding.] any of various members following and reinforcing primary framing members, esp. a plate or timber running along the top of a keel.
8. Currency [Numis.]
   • a former gold coin of Scotland, first issued by James III in 1475, whose obverse bears an equestrian figure of the king.
   • any of several gold or silver coins of the Netherlands bearing the figure of a horseman.

• Middle English ridere, Old English. See ride, -er¹ bef. 1100

rid′er•less, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

rider / ˈraɪdə/ noun

1. a person or thing that rides, esp a person who rides a horse, a bicycle, or a motorcycle
2. an additional clause, amendment, or stipulation added to a legal or other document, esp (in Britain) a legislative bill at its third reading
3. a statement made by a jury in addition to its verdict, such as a recommendation for mercy
4. any of various objects or devices resting on, surmounting, or strengthening something else
5. a thin seam, esp of coal or mineral ore, overlying a thicker seam

ˈriderless adjective