ignition
/ɪgˈnɪʃən/noun
mass noun
1- the action of setting something on fire or starting to burn点火, 着火：
three minutes after ignition, the flames were still growing.
点火三分钟后, 火焰仍越烧越高。
1.1
- the process of starting the combustion of fuel in the cylinders of an internal-combustion engine（内燃机汽缸燃料的）发火。
1.2
- count noun（一般作the ignition）the mechanism for bringing this about, typically activated by a key or switch（尤指以钥匙、开关发动的）发火装置：
he put the key in the ignition.
他把钥匙插入发火装置。
词源
early 17th cent. (denoting the heating of a substance to the point of combustion or chemical change)： from medieval Latin ignitio（n-）, from the verb ignire 'set on fire' （see IGNITE）.