ground zero

About 0.39 uses per million words.

Meaning

1. noun Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.
2. noun The location of any disaster or violent assault.
3. noun The point at which something begins.

Similar words

ground-zero hypocentre epicentre ground level ground control point ground origin epicenter nadir groundwater level

Word family

ground zeros