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au·to·ignition
plural -s
Definition of autoignition
1 : self-ignition in an internal-combustion engine cylinder either as a result of the heat of the compression alone or from this in combination with glowing carbon — compare preignition
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Merriam-Webster unabridgedWords at Play
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Time Traveler for autoignition
The first known use of autoignition was in 1901
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