Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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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.
zero-base having each budget expenditure justified on a basis of cost or need without consideration for the expenditures of a previous budget.
zero-sum of or describing a situation, such as a competition, in which the sum of the gains equals the sum of the losses.