Definition of zero
plural zeros also zeroes
1a : the arithmetical symbol 0 or 0ΜΈ denoting the absence of all magnitude or quantity
b : additive identity; specifically : the number between the set of all negative numbers and the set of all positive numbers
c : a value of an independent variable that makes a function equal to zero
- +2 and −2 arezeros of f(x)=x2−4
2: the absence of a measurable quantity — see table of numbers
3a (1) : the point of departure in reckoning; specifically : the point from which the graduation of a scale (as of a thermometer) begins
(2) : the temperature represented by the zero mark on a thermometer
b : the setting or adjustment of the sights of a firearm that causes it to shoot to point of aim at a desired range
4: an insignificant person or thing : nonentity
5a : a state of total absence or neutrality
b : the lowest point : nadir
6: something arbitrarily or conveniently designated zero