spontaneous combustion

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spon·ta·ne·ous com·bus·tion

the ignition of a mass of material by heat developed within it by the oxidation of the substances composing it without external ignition.
References in periodicals archive ?
New turbo technology * Direct Start&Stop * Compression Auto Ignition * Automated Shifted Manual with Electric Drive
Compression Auto Ignition, CAI, harnesses the benefits of a big engine to cut fuel consumption and lower exhaust emissions, however contradictory that might at first sound.
The NTSB stated that it was "very unlikely" that the Crane pumps were the ignition source, lumping them together with other unlikely ignition sources such as a meteor strike, lightning, a missile fragment, a small explosive charge, auto ignition, hot surface ignition, a fire migrating from another fuel tank, and static electricity.
June 5 /PRNewswire/ -- Prestolite Electric Incorporated and Auto Ignition Ltd.
Sarine, President and Managing Director of Auto Ignition.
The joint venture is designed to combine the high technology of Prestolite's products with the manufacturing and development skills of Auto Ignition.
26, 2015 /PRNewswire/ -- At least 13 people have died from carbon monoxide poisoning related to keyless auto ignitions.