noun, plural proxies.
the agency, function, or power of a person authorized to act as the deputy or substitute for another.
the person so authorized; substitute; agent.
a written authorization empowering another person to vote or act for the signer, as at a meeting of stockholders.
an ally or confederate who can be relied upon to speak or act in one's behalf.

1400–50; late Middle English prokesye, procusie, contraction of procuracy procuration. See procure, -acy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
proxy (ˈprɒksɪ)
n , pl proxies
1.  a person authorized to act on behalf of someone else; agent: to vote by proxy
2.  the authority, esp in the form of a document, given to a person to act on behalf of someone else
3.  computing short for proxy server
[C15: prokesye, contraction of procuracy, from Latin prōcūrātiō procuration; see procure]

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

c.1440, prokecye, "agency of one who acts instead of another," contraction of Anglo-Fr. procuracie, from M.L. procuratia "administration," from L. procuratio "care, management," from procurare "manage" (see procure).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

proxy definition

A person authorized to act for another, or the written authorization to act for another.

Note: Shareholders in corporations may designate proxies to represent them at stockholders' meetings and vote their shares.
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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Example sentences
In addition, many of the indicators or their proxies have only an indirect
  relationship to educational quality.
Yet none of these are reliable proxies for educational excellence.
But scientists are now discovering that data from a suite of animal proxies has
  the potential to fill in some of these holes.
The resolution of the information is often sharper than that in other proxies,
  such as ocean sediments.
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