grid Definition

grid
noun

1. A network of evenly spaced horizontal and vertical lines that can be superimposed on a map, chart, etc, especially in order to locate specific points.
2. Such a network used for constructing a chart.
3. The network of power transmission lines, consisting of overhead wires and underground cables, by means of which electricity is distributed from power stations across a region or country.

Form: the grid
Form: the national grid
4. A network of underground pipes by which gas, water, etc is distributed across a region or country.
5. A framework of metal bars, especially one covering the opening to a drain. See also grating.
6. An arrangement of lines marking the starting-points on a motor-racing track.
7. electronics.
An electrode, usually consisting of a perforated wire screen or a spiral of wire, that controls the flow of electrons from the cathode to the anode of a thermionic valve or vacuum tube.

Etymology: 19c: back-formation from gridiron.