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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 supported. [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. [PJC] 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. [PJC] 5. anything resembling a grid, as the Manhattan street grid. See also gridlock. [PJC] 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. [PJC] 7. (Football) the gridiron. [PJC]