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ground plane

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noun
(in perspective drawing) the theoretical horizontal plane receding from the picture plane to the horizon, beginning at the level of the base line.
Electricity. a ground plate or an underground mesh of radial wires connected to a vertical antenna (ground plane antenna ) that is grounded in order to provide suitable radiation characteristics.
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Origin of ground plane

First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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