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autoignition

[aw-toh-ig-nish-uh n] /ˌɔ toʊ ɪgˈnɪʃ ən/
noun
1.
Automotive. the spontaneous ignition of fuel when introduced into the combustion chamber of an internal-combustion engine, as a result either of glowing carbon in the chamber or of the heat of compression.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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