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preignition

[pree-ig-nish-uh n]
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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