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   ground zero

   noun

   • 1. the point on the earth's surface directly above or below an exploding nuclear bomb.
   • ▪ the site of the World Trade Center in New York, destroyed by terrorists on 11 September 2001.
   • ▪ a site of devastation, disaster, or violent attack: "the pictures from Indonesia's ground zero are beyond description"
   • 2. a starting point or base for an activity: "if you're starting at ground zero in terms of knowledge, go to the library"

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