1. (noun) nothing, nil, nix, nada, null, aught, cipher, cypher, goose egg, naught, zero, zilch, zip, zippo
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"
2. (noun) zero, 0, nought, cipher, cypher
a mathematical element that when added to another number yields the same number
3. (noun) zero, zero point
the point on a scale from which positive or negative numerical quantities can be measured
4. (adj) zero
the sight setting that will cause a projectile to hit the center of the target with no wind blowing
5. (adj) zero, 0
indicating the absence of any or all units under consideration
"a zero score"
6. (adj) zero(a)
having no measurable or otherwise determinable value
"the goal is zero population growth"
7. (adj) zero
indicating an initial point or origin
8. (verb) zero
of or relating to the null set (a set with no members)
9. (verb) zero
adjust (an instrument or device) to zero value
10. (verb) zero, zero in
adjust (as by firing under test conditions) the zero of (a gun)
"He zeroed in his rifle at 200 yards"
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Definition of 'ZERO' 
