American English

Definition of ground zero noun from the Oxford Advanced American Dictionary

     

    ground zero

     noun
    noun
     
    [uncountable]
     
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  1. 1the point on the earth's surface where a nuclear bomb explodes
  2. 2 Ground Zero the site of the World Trade Center in New York City, destroyed on September 11, 2001
  3. 3the beginning; a starting point for an activity
See the Oxford Advanced Learner's Dictionary entry: ground zero