Ignition (Autoignition) Temperature 1 : The minimum temperature required, at normal atmospheric pressure, to initiate or cause self-sustained combustion (independent of any externally heated element). (RP 500B)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}