Definition of pre-ignition in English:

pre-ignition

noun

  • [mass noun] The premature combustion of the fuel–air mixture in an internal combustion engine.

    • ‘High-octane fuel simply allows the higher pressures and temperatures in these high-output engines by preventing pre-ignition.’
    • ‘To run an engine on unleaded fuel it may be necessary to retard the initial timing to prevent detonation and/or pre-ignition.’
    • ‘Early ignition or runaway pre-ignition causes higher combustion chamber temperatures that can wreck the engine.’

Pronunciation:

pre-ignition

/priːɪɡˈnɪʃ(ə)n/