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preignition

[pree-ig-nish-uh n]
noun
  1. ignition of the charge in an internal-combustion engine earlier in the cycle than is compatible with proper operation.
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Origin of preignition

First recorded in 1895–1900; pre- + ignition
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pre-ignition

pre-ignition

noun
  1. ignition of all or part of the explosive charge in an internal-combustion engine before the exact instant necessary for correct operation
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012