the point on the surface of the earth or water directly below, directly above, or at which an atomic or hydrogen bomb explodes.
(sometimes initial capital letters) the site of the former World Trade Center in New York City, destroyed in the September 11, 2001 terrorist attacks.
Informal. the very beginning or most elementary level:
Some of the students are starting from ground zero.
a point on the surface of land or water at or directly above or below the centre of a nuclear explosion
a scene of great devastation
(sometimes capitals) the name given to the devastated site of the collapsed World Trade Center towers in New York after September 11 2001
1946, originally with reference to atomic blasts. In reference to the Sept. 11, 2001, terrorist attack on New York, it was in use by Sept. 13.
[groop] /grup/ noun 1. any collection or assemblage of persons or things; cluster; aggregation: a group of protesters; a remarkable group of paintings. 2. a number of persons or things ranged or considered together as being related in some way. 3. Also called radical. Chemistry. two or more atoms specifically arranged, as the hydroxyl group, […]
- Group 3
protocol, compression (G3) The CCITT fax protocol which uses data compression and allows a variety of file types (e.g. electronic mail, pictures, PostScript) to be transmitted over analogue telephone lines. The Group 3 protocol was published by CCITT in 1993. Full details of the protocol are available from ITU-T. See also Group 4. (1998-10-03)
- Group 4
protocol, compression (G4) The CCITT fax protocol which uses data compression and allows a variety of file types (e-mail, pictures, PostScript, etc.) to be transmitted over digital (ISDN) telephone lines. The Group 4 protocol was published by CCITT in 1993. Full details of the protocol are available from ITU-T. See also Group 3. (1998-09-10)
- Group agglutination
group agglutination n. The clumping of antibodies specific for a group of antigens common to several bacteria, each of which possesses its own specific antigen.