Ignition (noun)

1. The act or process of starting a fire or causing something to catch fire.
2. The mechanism used to start an engine, especially in a vehicle.
3. The act of starting or activating a device or system.

Origin:

Derived from the latin word 'ignis' meaning 'fire'.

Examples:

1. The ignition of the fireworks was the signal for the start of the festival.
2. He turned the key in the ignition to start the car's engine.
3. The ignition system on the airplane is responsible for starting the engines.
4. The ignition of the fuel in the engine caused the explosion.
5. The ignition of the furnace was the first step in the manufacturing process.