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spontaneous combustion
spon·ta·ne·ous com·bus·tion


noun 
Definition:
 
ignition from internal heat: the ignition of a combustible material such as hay as a result of internal heat generation usually caused by rapid oxidation
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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