ground zero

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Noun ground zero has 3 senses

ground zero - the target of a projectile (as a bomb or missile)
--₁ is a kind of target, target area
ground zero - the site of the World Trade Center before it was destroyed
--₂ is a kind of site, land site
ground zero - the point of detonation (or above or below) of a nuclear weapon
--₃ is a kind of point

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