What does the term "visibility" refer to in aviation?

In aviation, the term "visibility" specifically refers to the distance at which an object can be clearly seen. This definition is crucial for pilots because it directly affects their ability to operate an aircraft safely, particularly during takeoff, landing, and navigation. Clear visibility is essential for maintaining situational awareness and avoiding obstacles, other aircraft, or terrain.

The measurement of visibility is influenced by various factors, including weather conditions such as fog, rain, snow, and haze. These conditions can significantly decrease visibility and impact flight safety. Understanding visibility helps pilots make informed decisions regarding flight paths and landing approaches.

The concepts related to airport facilities, cloud heights, and the observation of weather patterns do not pertain to the definition of visibility in this context. Visibility is a specific measurement that pertains to the clarity and distance one can see, rather than an average distance of facilities or a timeframe for observing weather phenomena.