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ground zero - the point of detonation (or above or below) of a nuclear weapon. point - the precise location of something; a spatially limited location; she walked to a point where she could survey the whole street.
Meaning of measure zero. A set of points on the $x$-axis is said to have measure zero if the sum of the lengths of intervals enclosing all the points can be made arbitrarily small. If $f(x)$ is bounded in $[a,b]$, then a necessary and sufficient condition for the existence of $\int_a ^b f(x)dx$ is that the set of discontinuities have measure zero.