Definition of ZERO

  1. (adj)of or relating to the null set (a set with no members)
  2. (noun)a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential
  3. (noun)a mathematical element that when added to another number yields the same number
  4. (noun)the point on a scale from which positive or negative numerical quantities can be measured
  5. (noun)the sight setting that will cause a projectile to hit the center of the target with no wind blowing
  6. (adj)indicating the absence of any or all units under consideration
  7. (adj)having no measurable or otherwise determinable value
  8. (adj)indicating an initial point or origin
  9. (verb)adjust (an instrument or device) to zero value
  10. (verb)adjust (as by firing under test conditions) the zero of (a gun)