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ignition (n.)

1610s, "act of heating to the point of combustion," from French ignition or directly from Medieval Latin ignitionem (nominative ignitio), noun of action from past participle stem of Latin ignire "set on fire," from ignis "fire" (see igneous). Meaning "means of sparking a fire" (originally in a gun) is from 1881; meaning "means of sparking an internal combustion engine" is from 1906.

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Definitions of ignition from WordNet

ignition (n.)
the process of initiating combustion or catching fire;
ignition (n.)
the mechanism that ignites the fuel in an internal-combustion engine;
Synonyms: ignition system
ignition (n.)
the act of setting something on fire;
From wordnet.princeton.edu