Definitions from Wiktionary ( )

▸ noun:  (chemistry) An explosion or sudden report made by the near-instantaneous decomposition or combustion of unstable substances. Specifically, combustion that spreads supersonically via shock compression.
▸ noun:  (by extension) Any sudden explosion made by an exothermic process (whether chemical or not) that produces a supersonic shock wave.
▸ noun:  (mechanical engineering) Engine knocking, a type of improper combustion in gasoline piston engines.

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