General Definition: 1. The action of holding something with one hand and turning something with the other hand, such as the steering wheel and ignition of a car, or any thing or any action which can be associated with this in a given context. As a Noun: 1. The mechanism in an internal combustion engine of a vehicle that ignites (starts) the engine using a key or a switch. English = ignition. As a Verb or Adjective: 1. To ignite (start) the internal combustion engine of a vehicle using a key or a switch. Note: 1. Source of this recommended sign: Victorian College for the Deaf