igˈnishən noun
( -s )
1. : the act or action of igniting: as
a.
(1) : subjection to the action of fire or intense heat : setting fire : kindling
(2) : an analytical procedure of heating an inorganic substance with free access to air — compare incineration
b. : the setting fire to a single point of the charge in the explosion of a charge of powder for ballistic purposes
2. : the process or means of igniting a fuel mixture (as in an internal-combustion engine, a rocket engine, or an oil-burning furnace)