Preignition meaning

prē'ĭg-nĭsh'ən
The ignition of fuel in an internal-combustion engine before the spark passes through the fuel, resulting from a hot spot in the cylinder or from too great a compression ratio for the fuel.
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In an internal-combustion engine, ignition occurring before the intake valve is closed or before the spark plug fires.
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(automotive) The premature detonation of a fuel charge in Four-stroke cycle engines.
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