From The Collaborative International Dictionary of English v.0.48:

Grid \Grid\ (gr[i^]d), n.
   1. A grating of thin parallel bars, similar to a gridiron.
      [1913 Webster]

   2. (Elec.) A plate or sheet of lead with perforations, or
      other irregularities of surface, by which the active
      material of a secondary battery or accumulator is
      [Webster 1913 Suppl.]

   3. (Electronics) a mesh or coil of fine wire in an electron
      tube, connected to the circuit so as to regulate the
      current passing through the tube.

   4. any network of crossing horizontal and vertical lines; --
      they are used, for example, as reference coordinates to
      locate objects or places on a map.

   5. anything resembling a grid[4], as the Manhattan street
      grid. See also gridlock.

   6. a network of connected conductors for distributing
      electrical power, especially one using high-tension lines
      for wide geographic distribution of power; as, the
      Northeast power grid.

   7. (Football) the gridiron.
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