Meaning of visibility

vis•i•bil•i•ty

1. the state or fact of being visible.
2. the relative ability to be seen under given conditions of distance, light, atmosphere, etc.: low visibility due to fog.
3. Also calledthe distance at which a given standard object can be seen and identified with the unaided eye.
4. the ability to give a relatively large range of unobstructed vision: a windshield with good visibility.
5. legibility (def. 2).