Definitions for "Ignition temperature"
The lowest temperature of a substance at which sustained combustion can be initiated.
In the combustion of gases, the temperature at which the heat loss due to conduction, radiation, etc., is more than counterbalanced by the rate at which heat is developed by the combustion reaction.
Temperature at which the vapors emitted from a material will ignite either without exposure to a flame (self-ignition) or when a flame is introduced (flash ignition).