zero in WordNet English dictionary

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

1. indicating the absence of any or all units under consideration
   "a zero score"
   zero  0 
   
2. of or relating to the null set (a set with no members)
   zero 
   
3. having no measurable or otherwise determinable value
   "the goal is zero population growth"
   zero 
   
4. indicating an initial point or origin
   zero 
   

1. adjust (as by firing under test conditions) the zero of (a gun)
   "He zeroed in his rifle at 200 yards"
   zero  zero in 
   
2. adjust (an instrument or device) to zero value
   zero