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ground zero - the point of detonation (or above or below) of a nuclear weapon. point - the precise location of something; a spatially limited location; she walked to a point where she could survey the whole street.
Several meanings are applied to the word ground in test & measurement: 1  Signal Ground. A very low impedance return signal path to the circuit under test. 2  Earth Ground. The local zero voltage i.e. the voltage you see when connected to a metal stake in the ground or via a three pin AC power adapter. 3  Ground Reference.