I agree with the gp- while ground zero can have neutral or even positive vibes, the meaning is always that of point of origin of an explosion, real or metaphori

I agree with the gp- while ground zero can have neutral or even positive vibes, the meaning is always that of point of origin of an explosion, real or metaphoric. And I think that the meaning "most basic level" is wrong- the dictionaries might be simply recording a rare and wrong usage of the expression.