ground zero
UK /ˌɡɹaʊnd ˈzɪəɹəʊ/ · US /ˌɡɹaʊnd ˈzɪɚ(ˌ)oʊ/ noun, proper noun
Forms ground zeroes ground-zero
- noun Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.
- noun (by extension) The location of any disaster or violent assault.
- noun (figuratively) The point at which something begins.
- proper noun The site of the former World Trade Center towers in New York City destroyed on 11 September 2001.
Etymology
From ground + zero, first attested in a June 1946 a report by the United States Strategic Bombing Survey on the atomic bombing of Hiroshima and Nagasaki, Japan, on August 6 and 9, 1945, during World War II. “Zero” was used as the code name for the location of the Trinity atomic bomb test – the first detonation of a nuclear weapon – in New Mexico, USA, on July 16, 1945.
From the general term ground zero.
Sources: Wiktionary — from the Wiktionary entry “ground zero”, CC BY-SA 4.0. Details