The Collaborative International Dictionary of English v.0.48:

Scale \Scale\ (sk[=a]l), n. [AS. sc[=a]le; perhaps influenced by
   the kindred Icel. sk[=a]l balance, dish, akin also to D.
   schaal a scale, bowl, shell, G. schale, OHG. sc[=a]la, Dan.
   skaal drinking cup, bowl, dish, and perh. to E. scale of a
   fish. Cf. Scale of a fish, Skull the brain case.]
   1. The dish of a balance; hence, the balance itself; an
      instrument or machine for weighing; as, to turn the scale;
      -- chiefly used in the plural when applied to the whole
      instrument or apparatus for weighing. Also used
      figuratively.
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            Long time in even scale
            The battle hung.                      --Milton.
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            The scales are turned; her kindness weighs no more
            Now than my vows.                     --Waller.
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   2. pl. (Astron.) The sign or constellation Libra.
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   Platform scale. See under Platform.
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The Collaborative International Dictionary of English v.0.48:

Platform \Plat"form`\, n. [Plat, a. + -form: cf. F. plateforme.]
   1. A plat; a plan; a sketch; a model; a pattern. Used also
      figuratively. [Obs.] --Bacon.
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   2. A place laid out after a model. [Obs.]
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            lf the platform just reflects the order. --Pope.
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   3. Any flat or horizontal surface; especially, one that is
      raised above some particular level, as a framework of
      timber or boards horizontally joined so as to form a roof,
      or a raised floor, or portion of a floor; a landing; a
      dais; a stage, for speakers, performers, or workmen; a
      standing place.
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   4. A declaration of the principles upon which a person, a
      sect, or a party proposes to stand; a declared policy or
      system; as, the Saybrook platform; a political platform.
      "The platform of Geneva." --Hooker.
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   5. (Naut.) A light deck, usually placed in a section of the
      hold or over the floor of the magazine. See Orlop.
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   Platform car, a railway car without permanent raised sides
      or covering; a f?at.

   Platform scale, a weighing machine, with a flat platform on
      which objects are weighed.
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