from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Ignition of a substance, such as oily rags or hay, caused by a localized heat-increasing reaction between the oxidant and the fuel and not involving addition of heat from an outside source.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Combustion without an external source of heat.
from the GNU version of the Collaborative International Dictionary of English
- adj. combustion produced in a substance by the evolution of heat through the chemical action of its own elements; as, the spontaneous combustion of waste matter saturated with oil.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. ignition of a substance (as oily rags) resulting from an internal oxidation process
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