| zero | (adjective) of or relating to the null set (a set with no members) | - |
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| (adjective) indicating the absence of any or all units under consideration | Synonyms: 0 |
| (adjective) having no measurable or otherwise determinable value | - |
| (adjective) indicating an initial point or origin | - |
| (noun) the sight setting that will cause a projectile to hit the center of the target with no wind blowing | - |
| (noun) the point on a scale from which positive or negative numerical quantities can be measured | Synonyms: zero point |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, cypher, nought |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zilch, zip, zippo |
| (verb) adjust (as by firing under test conditions) the zero of (a gun) | Synonyms: zero in |
| (verb) adjust (an instrument or device) to zero value | - |
| zeroth | (adjective) preceding even the first | - |
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