Definitions from Wiktionary (Ground Zero)

▸ noun:  Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.
▸ noun:  (by extension) The location of any disaster or violent assault.
▸ noun:  (figuratively) The point at which something begins.
▸ noun:  The site of the former World Trade Center towers in New York City destroyed on 11 September 2001.
▸ Also see ground_zero


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