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.

auto-1 + ignition Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Autoignition temperature is a distinct measure from flammability limits in air.
Autoignition must occur almost exactly at the point where the piston reaches its maximum height within the cylinder.
Two types of autoignition and their engine applications.
In this combustion process a homogeneous charge of fuel and air is compression heated to the point of autoignition.
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