Learner's definition of VISIBILITY
the ability to see or be seen
— used especially to describe how far you are able to see because of weather conditions, darkness, etc.
It was a clear day with good visibility. [=a day when you could see a long distance because the air was clear]
flying/driving under conditions of poor/low/reduced visibility
The fog was very heavy and visibility was down to a few feet.
the quality or state of being known to the public