zero-point
adj1
Natural sciences, Physical sciences, Physics associated with zero on any scale, but particularly with a temperature of absolute zero
zero point
nounalso spelled zero-pointEtymology From early restandardization, possibly under influence of established US military terms such as zero hour, of the prior term point zero, which was coined during the Trinity Project, as point + zero, with zero being the code name for the Trinity test location. The original sense was that of ground zero and referred to only latitude and longitude, without regard to altitude, until the latter term's coinage in 1946.
1
Government, Military, Politics, War The location of the center of a burst of a nuclear weapon at the instant of detonation. The zero point may be in the air, or on or beneath the surface of land or water, depending upon the type of burst, and it is thus to be distinguished from ground zero.
2
Government, Military, Politics, War Obsolete Ground zero.