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Definition of Ground Zero
1. Noun. The target of a projectile (as a bomb or missile).
2. Noun. The site of the World Trade Center before it was destroyed.
3. Noun. The point of detonation (or above or below) of a nuclear weapon.
Generic synonyms: Point
Definition of Ground Zero
1. Proper noun. The site of the former World Trade Center towers in New York City destroyed on 11 September 2001. ¹
2. Noun. The point on the land or water surface below, above, or at which an atomic or nuclear bomb detonates ¹
3. Noun. (context: by extension) The location of any disaster ¹
¹ Source: wiktionary.com