ground zero

Noun ground zero has 3 senses

• ground zero(n = noun.location) - the target of a projectile (as a bomb or missile);
is a kind of target, target area

• ground zero(n = noun.location) - the site of the World Trade Center before it was destroyed;
is a kind of land site, site
is a part of greater new york, new york, new york city

• ground zero(n = noun.location) - the point of detonation (or above or below) of a nuclear weapon;
is a kind of point