Dictionary
ground zero
noun
: the point on the earth's surface directly above, below, or at which an explosion (especially a nuclear explosion) occurs
: the central point in an area of fast change or intense activity
: the beginning state or starting point
Full Definition of GROUND ZERO
1
: the point directly above, below, or at which a nuclear explosion occurs
2
: the center or origin of rapid, intense, or violent activity or change; broadly : center 2a <the party town that served as ground zero for those corporate … bashes — Rich Eisen>
3
: the very beginning : square one
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First Known Use of GROUND ZERO
1946
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