zero >> ˈzɪərəʊ
Definition: [number] no quantity or number; nought; the figure 0.
Example: figures from zero to nine
Definition: [verb] adjust (an instrument) to zero.
Example: zero the counter when the tape has rewound
Definition: [verb] set the sights of (a gun) for firing.
Example: the rifle had been zeroed at an elevation of 200