What is the definition of a "ceiling" in aviation?

The term "ceiling" in aviation is specifically defined as the lowest cloud layer that is reported as either broken or overcast. This is critical for pilots and flight operations, as it informs them about the vertical visibility and the conditions they may encounter upon approach and landing at an airport. A ceiling can significantly affect flight safety, particularly during landing and takeoff instructions, as it determines whether visual flight rules (VFR) or instrument flight rules (IFR) apply. Understanding cloud coverage is essential for evaluating how weather may impact flight operations, making this definition pertinent for dispatchers and pilots alike.