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English definition of “ground zero”

ground zero

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