The Collaborative International Dictionary of English v.0.48:

Casting \Cast"ing\, n.
   1. The act of one who casts or throws, as in fishing.
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   2. The act or process of making casts or impressions, or of
      shaping metal or plaster in a mold; the act or the process
      of pouring molten metal into a mold.
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   3. That which is cast in a mold; esp. the mass of metal so
      cast; as, a casting in iron; bronze casting.
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   4. The warping of a board. --Brande & C.
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   5. The act of casting off, or that which is cast off, as
      skin, feathers, excrement, etc.
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   Casting of draperies, the proper distribution of the folds
      of garments, in painting and sculpture.

   Casting line (Fishing), the leader; also, sometimes applied
      to the long reel line.

   Casting net, a net which is cast and drawn, in distinction
      from a net that is set and left.

   Casting voice, Casting vote, the decisive vote of a
      presiding officer, when the votes of the assembly or house
      are equally divided. "When there was an equal vote, the
      governor had the casting voice." --B. Trumbull.

   Casting weight, a weight that turns a balance when exactly
      poised.
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