## Definition of zero

**:**the arithmetical symbol 0 or 0̸ denoting the absence of all magnitude or quantity

**:**additive identity; specifically

**:**the number between the set of all negative numbers and the set of all positive numbers

**:**a value of an independent variable that makes a function equal to zero

- +2 and −2 are zeros of
*f(x)=x*^{2}−4

**:**the absence of a measurable quantity — see Table of Numbers

**:**the point of departure in reckoning; specifically

**:**the point from which the graduation of a scale (as of a thermometer) begins

**:**the temperature represented by the zero mark on a thermometer

**:**the setting or adjustment of the sights of a firearm that causes it to shoot to point of aim at a desired range

**:**an insignificant person or thing

**:**nonentity

**:**a state of total absence or neutrality

**:**the lowest point

**:**nadir

**:**something arbitrarily or conveniently designated zero