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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.
Definition of ground for Students. 1  1 : the surface of the earth Leaves fell to the ground. 2  2 : 2soil 1, earth The beans themselves popped out of the ground. 3  3 : the bottom of a body of water The boat struck ground.  4 : an area of land sacred 1  ground. 5 : an area used for some purpose a hunting ground.