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From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Device \De*vice"\, n. [OE. devis, devise, will, intention,
     opinion, invention, fr. F. devis architect's plan and
     estimates (in OF., division, plan, wish), devise device (in
     sense 3), in OF. also, division, wish, last will, fr.
     deviser. See {Devise}, v. t., and cf. {Devise}, n.]
     1. That which is devised, or formed by design; a contrivance;
        an invention; a project; a scheme; often, a scheme to
        deceive; a stratagem; an artifice.
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              His device in against Babylon, to destroy it. --Jer.
                                                    li. 11.
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              Their recent device of demanding benevolences.
                                                    --Hallam.
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              He disappointeth the devices of the crafty. --Job v.
                                                    12.
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     2. Power of devising; invention; contrivance.
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              I must have instruments of my own device. --Landor.
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     3.
        (a) An emblematic design, generally consisting of one or
            more figures with a motto, used apart from heraldic
            bearings to denote the historical situation, the
            ambition, or the desire of the person adopting it. See
            {Cognizance}.
        (b) Improperly, an heraldic bearing.
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                  Knights-errant used to distinguish themselves by
                  devices on their shields.         --Addison.
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                  A banner with this strange device 
                  Excelsior.                        --Longfellow.
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     4. Anything fancifully conceived. --Shak.
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     5. A spectacle or show. [Obs.] --Beau. & Fl.
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     6. Opinion; decision. [Obs.] --Rom. of R.
  
     7. any artifactual object designed to perform an action or
        process, with or without an operator in attendance.
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     Syn: Contrivance; invention; design; scheme; project;
          stratagem; shift.
  
     Usage: -- {Device}, {Contrivance}. Device implies more of
            inventive power, and contrivance more of skill and
            dexterity in execution. A device usually has reference
            to something worked out for exhibition or show; a
            contrivance usually respects the arrangement or
            disposition of things with reference to securing some
            end. Devices were worn by knights-errant on their
            shields; contrivances are generally used to promote
            the practical convenience of life. The word device is
            often used in a bad sense; as, a crafty device;
            contrivance is almost always used in a good sense; as,
            a useful contrivance.
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From WordNet (r) 3.0 (2006) [wn]:

  device
      n 1: an instrumentality invented for a particular purpose; "the
           device is small enough to wear on your wrist"; "a device
           intended to conserve water"
      2: something in an artistic work designed to achieve a
         particular effect
      3: any clever maneuver; "he would stoop to any device to win a
         point"; "it was a great sales gimmick"; "a cheap promotions
         gimmick for greedy businessmen" [syn: {device}, {gimmick},
         {twist}]
      4: any ornamental pattern or design (as in embroidery)
      5: an emblematic design (especially in heraldry); "he was
         recognized by the device on his shield"