The Collaborative International Dictionary
Combustibility \Com*bus`ti*bil"i*ty\, n. The quality of being combustible.
Wiktionary
n. The quality or state of being combustible
Wikipedia
Combustibility is a measure of how easily a substance will set on fire, through fire or combustion. This is an important property to consider when a substance is used for construction or is being stored. It is also important in processes that produce combustible substances as a by-product. Special precautions are usually required for substances that are easily combustible. These measures may include installation of fire sprinklers or storage remote from possible sources of ignition.
Substances with low combustibility may be selected for construction where the fire risk needs to be reduced. Like apartment buildings, houses, offices and so on. If combustible resources are used there is greater chance of fire accidents and deaths. Fire resistant substances are preferred for building materials and furnishings.
Usage examples of "combustibility".
To-day our task is to overcome this concept by taking a step corresponding to the one that led to it, that is, by a study of combustibility which does justice to both sides of the process involved.
Such was his skill and the combustibility of Avidan firebush that he soon had a good blaze going.