Definitions

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

  • n. A device, especially the gas pedal of a motor vehicle, for increasing speed.
  • n. Chemistry A substance that increases the speed of a reaction.
  • n. Physics A particle accelerator.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One who, or that which, accelerates.
  • n. A device for causing acceleration.
  • n. A substance which speeds up chemical reactions.
  • n. An accelerator pedal.
  • n. A chemical that reduces development time.
  • n. A device that accelerates charged subatomic particles.
  • n. A muscle or nerve that speed the performance of an action.
  • n. accelerator key

from the GNU version of the Collaborative International Dictionary of English

  • n. One who, or that which, accelerates. Also as an adj..

from The Century Dictionary and Cyclopedia

  • n. One who or that which accelerates; a hastener.
  • n. A device in a motor-car by which the operator may render inoperative the speed governor of the motor. If the governor is of the centrifugal type, as the speed increases the balls or weights fly outward against the action of a spring. The accelerator increases the tension of the spring or draws the balls inward directly, so that the governor ceases to act to close the throttle or regulate speed as the motor increases its number of revolutions above the limit set by the normal tension of the springs.

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

  • n. a valve that regulates the supply of fuel to the engine
  • n. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
  • n. a scientific instrument that increases the kinetic energy of charged particles
  • n. a pedal that controls the throttle valve

Etymologies

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