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English definition of “ground zero”

ground zero

noun    
[C usually singular] the exact place where a nuclear bomb explodes: The blast was felt as far as 30 miles from ground zero.Places and locationsUnpleasant places Ground Zero the place where the World Trade Center stood in New York City before it was destroyed in an attack on 11 September, 2001Places and locationsUnpleasant places
(Definition of ground zero noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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