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- DictionaryZe·ro/ˈzirō/
cardinal
- 1. no quantity or number; naught; the figure 0: "figures from zero to nine"
verb
- 1. adjust (an instrument) to zero: "zero the counter when the tape has rewound"
- 2. set the sights of (a gun) for firing: "the rifle had been zeroed at an elevation of 200"