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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.
For other uses, see Absolute Zero (disambiguation). Absolute zero is the lower limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reaches its minimum value, taken as 0.