The Collaborative International Dictionary of English v.0.48:

Procuration \Proc`u*ra"tion\, n. [L. procuratio: cf. F.
   procuration. See Procure.]
   [1913 Webster]
   1. The act of procuring; procurement.
      [1913 Webster]

   2. The management of another's affairs.
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   3. The instrument by which a person is empowered to transact
      the affairs of another; a proxy.
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   4. (Ch. of Eng.) A sum of money paid formerly to the bishop
      or archdeacon, now to the ecclesiastical commissioners, by
      an incumbent, as a commutation for entertainment at the
      time of visitation; -- called also proxy.
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   Procuration money (Law), money paid for procuring a loan.
      --Blackstone.
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The Collaborative International Dictionary of English v.0.48:

Proxy \Prox"y\, v. i.
   To act or vote by proxy; to do anything by the agency of
   another. [R.]
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The Collaborative International Dictionary of English v.0.48:

Proxy \Prox"y\, n.; pl. Proxies. [Contr. from procuracy. Cf.
   Proctor.]
   1. The agency for another who acts through the agent;
      authority to act for another, esp. to vote in a
      legislative or corporate capacity.
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            I have no man's proxy: I speak only for myself.
                                                  --Burke.
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   2. The person who is substituted or deputed to act or vote
      for another.
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            Every peer . . . may make another lord of parliament
            his proxy, to vote for him in his absence.
                                                  --Blackstone.
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   3. A writing by which one person authorizes another to vote
      in his stead, as in a corporation meeting.
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   4. (Eng. Law) The written appointment of a proctor in suits
      in the ecclesiastical courts. --Burrill.
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   5. (Eccl.) See Procuration. [Obs.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

proxy
    n 1: a person authorized to act for another [syn: proxy,
         placeholder, procurator]
    2: a power of attorney document given by shareholders of a
       corporation authorizing a specific vote on their behalf at a
       corporate meeting

The Free On-line Dictionary of Computing (19 January 2023):

proxy

    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.

   (2007-09-03)