Definition

1. Noun:
   • A key that operates the ignition switch of an automotive engine: A physical key designed to be inserted into and turned in a vehicle's ignition switch to start the engine and power the vehicle's electrical systems.

Usage

• The term "ignition key" specifically refers to the key for a motor vehicle's ignition system. It is used when discussing starting a car, security, or loss of access to a vehicle.
• It is typically used in singular form ("the ignition key") but can be pluralized when referring to multiple keys ("spare ignition keys").

Examples

• Noun:
  • I turned the ignition key and the engine started smoothly.
  • She realized she had left her ignition key on the kitchen counter.
  • Modern cars often have keyless systems, replacing the traditional metal ignition key.

Advanced Usage

• "to leave the ignition key in the car": An act of leaving the key in the ignition switch, often implying carelessness or a security risk.
  • He was fined for leaving the ignition key in an unattended vehicle.

Variants and Related Words

• Key fob (n): A remote control device, often attached to a key ring, used for keyless entry and sometimes containing the ignition key or its electronic equivalent.

  • My key fob unlocks the doors and also has a hidden mechanical ignition key inside.

• Ignition switch (n): The electrical switch in a vehicle, operated by the ignition key, that activates the starter and the engine's electrical circuits.

  • The mechanic replaced the faulty ignition switch.

Synonyms

• Car key (n): A general term for a key used to operate a car, which may include the ignition key as its primary function.
• Starter key (n): A less common synonym emphasizing the function of starting the engine.

Related Phrases

• Ignition key cylinder: The part of the ignition switch where the key is inserted.
  • The thief damaged the ignition key cylinder trying to hot-wire the car.

Noun

1. a key that operates the ignition switch of an automotive engine