___ means the minimum ceiling, expressed in feet above the airport elevation, required for takeoff or required for designating an airport as an alternate airport.

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Ceiling is the height of the lowest cloud layer or obscuring phenomenon above the airfield, expressed in feet above the airport elevation. This minimum ceiling is used to determine takeoff minimums and whether an airport can be designated as an alternate. It specifically focuses on the cloud base that affects flight operations, which is why it fits the description. The other terms describe different concepts—visibility is about how far you can see, altitude is a general height, and weather envelope isn’t about the cloud base for operations—so they don’t match the idea of a minimum cloud base needed for takeoff or alternates.