Flammability is how easily something will burn or ignite, causing fire or combustion. The degree of difficulty required to cause the combustion of a substance is quantified through fire testing. Internationally, a variety of test protocols exist to quantify flammability. The ratings achieved are used in building codes, insurance requirements, fire...
Flammability is the ease with which a substance will ignite, causing fire or combustion.
• (n.) The quality of being flammable; inflammability.
Flam`ma·bil'ity noun The quality of being flammable; inflammability. [ Obsolete] Sir T. Browne. 
flammability The quality of being flammable; inflammability.
Measure of the extent to which a material will support combustion.
inflammability noun the quality of being easily ignited and burning rapidly
Measure of the extent to which a material will support combustion.