the act or fact of igniting; state of being ignited.
a means or device for igniting.
(in an internal-combustion engine) the process that ignites the fuel in the cylinder.

1605–15; Medieval Latin ignītiōn- (stem of ignītiō) a setting on fire. See ignite, -ion

reignition, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ignition (ɪɡˈnɪʃən)
1.  the act or process of initiating combustion
2.  the process of igniting the fuel in an internal-combustion engine
3.  the ignition the devices used to ignite the fuel in an internal-combustion engine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Folks leave their cars unlocked, keys in the ignition.
The column is then filled with combustible materials, ready for ignition.
The cause of the ignition of some cargo item put in the plane is not yet
  determined at the time of writing.
The heat from this ignition starts the decomposition of the sodium azide and
  the generation of nitrogen gas to fill the air bag.
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