- the point on the surface of the earth or water directly below, directly above, or at which an atomic or hydrogen bomb explodes.
- the site of the former World Trade Center in New York City, destroyed in the September 11, 2001 terrorist attacks.
- the very beginning or most elementary level: Some of the students are starting from ground zero.
- a point on the surface of land or water at or directly above or below the centre of a nuclear explosion
- a scene of great devastation
- the name given to the devastated site of the collapsed World Trade Center towers in New York after September 11 2001
