a person who rides a horse or other animal, a bicycle, etc.
something that rides.
an additional clause, usually unrelated to the main body, attached to a legislative bill in passing it.
an addition or amendment to a document, testament, etc.
any object or device that straddles, is mounted upon, or is attached to something else.
a rail or stake used to brace the corners in a snake fence.
Shipbuilding. any of various members following and reinforcing primary framing members, especially a plate or timber running along the top of a keel.
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.

before 1100; Middle English ridere, Old English. See ride, -er1

riderless, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rider (ˈraɪdə)
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.  (Brit) 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 small weight that can be slid along one arm of a chemical balance to make fine adjustments during weighing
6.  geology a thin seam, esp of coal or mineral ore, overlying a thicker seam

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"one who rides," O.E. ridere, from ride (q.v.). Meaning "clause tacked on to a document after first draft" is from 1669.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

rider definition

A provision, usually controversial and unlikely to pass on its own merits, that is attached to a popular bill in the hopes that it will “ride” to passage on the back of the popular bill.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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