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.
      [1913 Webster]

   3. The instrument by which a person is empowered to transact
      the affairs of another; a proxy.
      [1913 Webster]

   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.
      [1913 Webster]

   Procuration money (Law), money paid for procuring a loan.
      --Blackstone.
      [1913 Webster]

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.]
   [1913 Webster]

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.
      [1913 Webster]

            I have no man's proxy: I speak only for myself.
                                                  --Burke.
      [1913 Webster]

   2. The person who is substituted or deputed to act or vote
      for another.
      [1913 Webster]

            Every peer . . . may make another lord of parliament
            his proxy, to vote for him in his absence.
                                                  --Blackstone.
      [1913 Webster]

   3. A writing by which one person authorizes another to vote
      in his stead, as in a corporation meeting.
      [1913 Webster]

   4. (Eng. Law) The written appointment of a proctor in suits
      in the ecclesiastical courts. --Burrill.
      [1913 Webster]

   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

Moby Thesaurus II by Grady Ward, 1.0:

211 Moby Thesaurus words for "proxy":
   Australian ballot, Hare system, Indiana ballot,
   Massachusetts ballot, absentee ballot, advocate, agency, agent,
   agentship, alter ego, alternate, alternative, amicus curiae,
   analogy, assignee, assignment, attorney, authority, authorization,
   aye, backup, backup man, ballot, ballot-box stuffer, balloter,
   blanket ballot, brevet, canvass, canvassing, care, casting vote,
   champion, change, changeling, charge, commission, commissioning,
   commitment, comparison, consignment, copy, counterfeit,
   counting heads, cumulative voting, cure, deciding vote, delegate,
   delegated authority, delegation, deputation, deputy, devolution,
   devolvement, division, double, dummy, elector, embassy,
   empowerment, enfranchisement, entrusting, entrustment, equal,
   equivalent, errand, ersatz, exchange, executive officer,
   executorship, exequatur, exponent, factor, factorship, fagot vote,
   fake, figurehead, fill-in, floater, franchise, fraudulent voter,
   full power, ghost, ghostwriter, graveyard vote, hand vote,
   imitation, jurisdiction, legation, license, lieutenancy,
   lieutenant, list system, locum, locum tenens, long ballot,
   makeshift, mandate, metaphor, metonymy, mission, mock, nay,
   next best thing, no, nonpartisan ballot, nontransferable vote,
   office, office-block ballot, paranymph, party emblem,
   party-column ballot, personnel, phony, pinch, pinch hitter,
   pleader, plebiscite, plebiscitum, plenipotentiary power, plumper,
   plural vote, poll, polling, power of attorney, power to act,
   preferential voting, procuration, procurator,
   proportional representation, provisional, purview, record vote,
   referendum, regency, regentship, registered voter, relief,
   repeater, replacement, representation, representative, reserve,
   reserves, responsibility, right to vote, ringer, rising vote,
   sample ballot, say, second in command, second string, secondary,
   secret ballot, short ballot, show of hands, sign, single vote,
   slate, snap vote, spare, spares, split ticket, stand-in, stopgap,
   straight ticket, straw vote, sub, substituent, substitute,
   substitution, succedaneum, suffrage, superseder, supplanter,
   surrogate, symbol, synecdoche, task, temporary, tentative,
   third string, ticket, token, transferable vote, trust, trusteeship,
   understudy, utility, utility man, utility player, vicar,
   vicar general, vicarious, vicarious authority, vice,
   vice-president, vice-regent, vicegerent, viva voce, voice,
   voice vote, vote, voter, voting, voting right, warrant, write-in,
   write-in vote, yea, yeas and nays, yes



The Free On-line Dictionary of Computing (30 December 2018):

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)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

PROXY. A person, appointed in the place of another, to represent him.
     2. In the ecclesiastical law, a judicial proctor, or one who is
appointed to manage another man's law concerns, is called a proxy. Ayl.
Parerg.
     3. The instrument by which a person is appointed so to act, is likewise
called a proxy.
     4. Proxies are also annual payments made by the parochial clergy to the
bishop, &c., on visitations. Tom. Law Dictionary, h.t. Vide Rutherf. Inst.
253; Hall's Pr. 14.
     5. The right of voting at an election of an incorporated company by
proxy is not a general right, and the party claiming it must show a special
authority for that purpose. Ang. on Corp. 67-69; 1 Paige's Ch. Rep. 590; 5
Day's Rep. 329; 5 Cowen, Rep. 426.