An ignition is the firing up of something, usually an engine. Without ignition, your vehicle isn't going anywhere.

You know how igniting is setting something on fire? That should help you remember that ignition means something is catching fire, like the gadget that ignites the fuel in an internal-combustion engine. Turning the key in a car causes ignition: now the car has started. If the car's battery is dead or there's no gas, ignition isn't possible, and the car won't start. To remember what ignition is, just say the catchphrase of the Human Torch: "Flame on!"

Definitions of ignition

n the process of initiating combustion or catching fire

spontaneous combustion
ignition of a substance (as oily rags) resulting from an internal oxidation process
Type of:
fire, flame, flaming
the process of combustion of inflammable materials producing heat and light and (often) smoke

n the act of setting something on fire

firing, inflammation, kindling, lighting
Type of:
burning, combustion
the act of burning something

n the mechanism that ignites the fuel in an internal-combustion engine

ignition system
Type of:
device consisting of a piece of machinery; has moving parts that perform some function

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