ground ze·ro • n. [in sing.] the point on the earth's surface directly above or below an exploding nuclear bomb. ∎ the site of the former World Trade Center in New York City in the wake of the terrorist attacks of September 11, 2001. ∎ fig. a starting point or base for some activity: if you're starting at ground zero in terms of knowledge, go to the library.
"ground zero." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (July 21, 2018). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ground-zero
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