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grid (n.)

1839, shortening of gridiron or griddle. City planning sense is from 1954 (hence gridlock). Meaning "network of transmission lines" first recorded 1926.

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Definitions of grid

grid (n.)
a pattern of regularly spaced horizontal and vertical lines;
grid (n.)
a system of high tension cables by which electrical power is distributed throughout a region;
Synonyms: power system / power grid
grid (n.)
a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material;
Synonyms: storage-battery grid
grid (n.)
an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube;
Synonyms: control grid
grid (n.)
a cooking utensil of parallel metal bars; used to grill fish or meat;
Synonyms: gridiron
From wordnet.princeton.edu