1. 灭火：extinguishing medium 灭火药剂 | extinguishing 灭火 | extinguishment 灭火

2. 熄火：extinguishing vapour 灭火蒸气 | extinguishing 熄火 | extinguishment by dilution 稀释灭火

3. extinguishing：exting; 熄灭

noun

1. the act of extinguishing
causing to stop burning

e.g. the extinction of the lights

Synonym: extinctionquenching