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: the point directly above, below, or at which a nuclear explosion occurs
: the center or origin of rapid, intense, or violent activity or change
: center sense 2a
the party town that served as ground zero for those corporate … bashes —Rich Eisen
: the very beginning : square one
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axis, base, capital, center, central, core, cynosure, epicenter, eye, focus, heart, hub, locus, mecca, navel, nerve center, nucleus, seat
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1946, in the meaning defined at sense 1
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8 Sep 2018
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More Definitions for ground zero
: the point on the earth's surface directly above, below, or at which an explosion (especially a nuclear explosion) occurs
: the central point in an area of fast change or intense activity
: the beginning state or starting point
See the full definition for ground zero in the English Language Learners Dictionary
More from Merriam-Webster on ground zero
Thesaurus: All synonyms and antonyms for ground zero
Britannica.com: Encyclopedia article about ground zero
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the setting in which something occurs
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