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adjust (as by firing under test conditions) the zero of (a gun); "He zeroed in his rifle at 200 yards"
adjust (an instrument or device) to zero value
the sight setting that will cause a projectile to hit the center of the target with no wind blowing
the point on a scale from which positive or negative numerical quantities can be measured
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"
a mathematical element that when added to another number yields the same number