zero

noun

1.
a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential
aught cipher cypher goose egg nada naught nil nix nothing null zilch zip zippo
Derived from:
zero
2.
a mathematical element that when added to another number yields the same number
0 cipher cypher nought
Derived from:
zero
3.
the point on a scale from which positive or negative numerical quantities can be measured
zero point
Derived from:
zero
4.
the sight setting that will cause a projectile to hit the center of the target with no wind blowing