Etymology
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ground zero (n.)

1946, originally with reference to atomic blasts. In reference to the Sept. 11, 2001, terrorist attack on New York, it was in use by Sept. 13.

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Definitions of ground zero

ground zero (n.)
the target of a projectile (as a bomb or missile);
ground zero (n.)
the site of the World Trade Center before it was destroyed;
ground zero (n.)
the point of detonation (or above or below) of a nuclear weapon;
From wordnet.princeton.edu