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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Computing Dictionary

proxy definition

A process that accepts requests for some service and passes them on to the real server. A proxy may run on dedicated hardware or may be purely software. It may transform the request in some way or provide some additional layer of functionality such as caching or remote access. A proxy may be intended to increase security, e.g. a web proxy that allows multiple clients inside an organisation to access the Internet through a single secure, shared connection.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Scientists must go through a huge check-list of reasons why they must use a
  living animal and not a proxy to do their research.
In this event the visitor by proxy lays her own card as well as that of the
  invalid on the tray proffered her.
Serving as the other's consigliere, as well as proxy.
Loan default rates, etc serve as an incredibly poor proxy for educational
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