ignition

n. act of igniting or causing to burn; state of catching fire

Ignition occurs when the heat produced by a reaction becomes sufficient to sustain a chemical reaction. The sudden change from a cold gas to a hot plasma in a plasma source is also called ignition.Other uses of ignition include:in chemistry, it refers to heating a material to the point that it spontaneously combusts, or until it ceases to lose mass.in nuclear fusion, it refers to the conditions under which a plasma can be maintained by fusion reactions without external energy input.in semiconductor processing, ignition is the process of starting up a plasma generator. In DC plasma systems, this involves a transition from voltaic arcing to sustained and delocalized plasma generation.an ignition system is a method for activating and controlling the combustion of fuel in an internal combustion engine, often through the use of a key
See more at Wikipedia.org...

Noun
1. the process of initiating combustion
(hypernym) natural process, natural action, action, activity
(hyponym) spontaneous combustion
(derivation) ignite, light
2. the mechanism that ignites the fuel in an internal-combustion engine
(synonym) ignition system
(hypernym) mechanism
(part-holonym) electrical system
(part-meronym) distributor, distributer, electrical distributor
3. the act of setting on fire or catching fire
(synonym) firing, lighting, kindling, inflammation
(hypernym) burning, combustion
(derivation) erupt, ignite, catch fire, take fire, combust, conflagrate

n. ignition, act of igniting or causing to burn

(n.)
The state of being ignited or kindled.
  

(n.)
The act of igniting, kindling, or setting on fire.