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Definition of Zero in
1. Verb. Direct onto a point or target, especially by automatic navigational aids.
2. Verb. Adjust (as by firing under test conditions) the zero of (a gun). "He zeroed in his rifle at 200 yards"
Definition of Zero in
1. Verb. To focus one's aim; to zoom in and center on something. ¹
¹ Source: wiktionary.com