Definition - zero

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zero
  1. adjust (as by firing under test conditions) the zero of (a gun); "He zeroed in his rifle at 200 yards"
  2. adjust (an instrument or device) to zero value
  3. the sight setting that will cause a projectile to hit the center of the target with no wind blowing
  4. the point on a scale from which positive or negative numerical quantities can be measured
  5. a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it"
  6. a mathematical element that when added to another number yields the same number
  7. indicating the absence of any or all units under consideration; "a zero score"
  8. indicating an initial point or origin
  9. having no measurable or otherwise determinable value; "the goal is zero population growth"
  10. of or relating to the null set (a set with no members)