Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The raising of a substance to its ignition point, as by electric current, friction, or mechanical shock.
  • n. An electrical system, typically powered by a battery or magneto, that provides the spark to ignite the fuel mixture in an internal-combustion engine.
  • n. A switch that activates this system.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The act of igniting.
  • n. The initiation of combustion.
  • n. A system for activating combustion in a combustion engine.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of igniting, kindling, or setting on fire.
  • n. The state of being ignited or kindled.

from The Century Dictionary and Cyclopedia

  • n. The act of igniting, kindling, or setting on fire.
  • n. Means of igniting; provision for firing.
  • n. The state of being ignited; a burning.
  • n. In chem., the process of roasting or intensely heating a substance.
  • n. In internal-combustion motors, the setting fire to the mixture of air and hydrocarbon vapor in the cylinder, so that the air shall expand and increase its pressure and perform the work required.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the process of initiating combustion or catching fire
  • n. the mechanism that ignites the fuel in an internal-combustion engine
  • n. the act of setting something on fire

Etymologies

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