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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.
ground truth. n. 1. Factual data as ascertainable through direct observation rather than through inference from remote sensing. 2. The reality of a situation as experienced firsthand rather than by report: The regime claims to be winning, but the ground truth is that the rebels are making steady gains.