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| ground ze·ro (plural ground ze·roes) |
noun |
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| Definition: |
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1. point of nuclear explosion: the point on the surface of land or water that is precisely the site of detonation of a nuclear weapon or the point immediately above or below it
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2. center of activity: the focal point or center of a particular activity or development
  The war-torn country has been ground zero for an international terrorist network.
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3. basic level: the most basic level or starting point for an activity
to learn programming from ground zero
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4. dirty place: an extremely dirty messy place or room
(
informal
)
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5. assault location: a location targeted by police to assault, using, e.g., SWAT units or hostage rescue teams
(
informal
)
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