What do the letters "CAVOK" signify in an aviation context?

In aviation, the term "CAVOK" stands for "Ceiling and Visibility OK." This phrase is used in meteorological reports and signifies that the weather conditions are suitable for flying, with no significant weather phenomena or obstructions present. Specifically, it means that visibility is 10 kilometers or greater, and there are no significant clouds below 5,000 feet or below the highest minimum sector altitude. Additionally, no significant weather events, such as rain, snow, or thunderstorms, are occurring in the area.

This term is especially important in the context of aviation safety and operations, as pilots rely on these conditions to make informed decisions regarding their flights. The clear communication of weather conditions through standardized terminology like "CAVOK" helps ensure a common understanding among pilots, air traffic control, and meteorological services.

The other options contain elements that are not used in the official definition of "CAVOK." For example, while clouds and visibility are indeed part of the aviation weather context, the specific phrase "CAVOK" correctly relates to ceilings, making the correct choice definitive in this case.