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 th...
• (n.) The quality of being combustible.
Com·bus`ti·bil'i·ty noun The quality of being combustible. 
combustibleness noun the quality of being capable of igniting and burning