
Multiword Results
absolute zero 
the lowest possible temperature for any known substance, equal to 273.15 degrees Celsius or 459.67 degrees Fahrenheit. 
ground zero 
the land or water surface directly above or below the point at which a nuclear bomb explodes. 
zero gravity 
the condition of apparent weightlessness, as of a body in orbit, when the apparent effect of gravity is zero. 
zero hour 
the time at which a military attack or other operation is scheduled to begin. [2 definitions] 
zero population growth 
a condition in a given population in which the number of live births equals the number of deaths, so that the population remains constant. 
zerobase 
having each budget expenditure justified on a basis of cost or need without consideration for the expenditures of a previous budget. 
zerosum 
of or describing a situation, such as a competition, in which the sum of the gains equals the sum of the losses. 

