accelerator meaning

[ æk'seləreitə ] Pronunciation:   "accelerator" in a sentence
Noun: accelerator  ak'selu`reytu(r)
  1. A pedal that controls the throttle valve
    - accelerator pedal, gas pedal [N. Amer], gas [N. Amer], throttle, gun 
  2. A valve that regulates the supply of fuel to the engine
    - throttle, throttle valve 
  3. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    - catalyst 
  4. A scientific instrument that increases the kinetic energy of charged particles
    - particle accelerator, atom smasher

Derived forms: accelerators

See also: accelerate

Type of: activator, foot lever, foot pedal, pedal, scientific instrument, treadle, valve

Part of: aeroplane [Brit], airplane [N. Amer], auto, automobile, car, fuel system, machine, motorcar, plane

Encyclopedia: Accelerator


A substance which, when added to concrete, mortar, or grout, increases the rate of hydration of a hydraulic cement, shortens the time of set, or increases the rate of hardening or strength development.


A substance, added with a curing agent, to speed a vulcanization process and enhance the physical properties of a vulcanized material.


Same as accelerating admixture.

noun [C]

a company that helps new companies get started by giving them such things as office space, legal help and marketing services in exchange for payment:

The company expected to open 22 'accelerators' meant to foster new online businesses.

A model relating investment to changes in output. The accelerator model asserts that firms invest more when output is rising and less when it is falling. This seems reasonable: a rise in demand leads some firms to produce more, and leads them and other firms to expect that demand will rise further. The rise in output raises the ratio of output to capacity, and the expectation of further rises in demand makes firms believe it would be profitable to have more capital equipment. Accelerator-type models do help empirically to explain variations in both fixed investment and investment in stocks and work in progress.

[Mechanical engineering]
A device for varying the speed of an automotive vehicle by varying the supply of fuel.


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  1. accelerators are now used almost universally.
  2. instinctively, his accelerator foot slammed to the floor.
  3. i pressed the accelerator until the engine screamed.
  4. the driver pressed on the accelerator, savagely roaring the engine.
  5. perhaps partons or quarks will be found with this accelerator.

Related Words

  1. acceleration torque meaning
  2. acceleration unit meaning
  3. acceleration voltage meaning
  4. acceleration-error constant meaning
  5. accelerative meaning
  6. accelerator board meaning
  7. accelerator card meaning
  8. accelerator factor meaning
  9. accelerator globulin meaning
  10. accelerator jet meaning
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