accelerator

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accelerator
  • noun
    A person or thing that causes something to happen or develop more quickly. (the country has been the main accelerator of global growth for a decade)
    A device, typically a foot pedal, which controls the speed of a vehicle's engine. (he pressed the accelerator to the floor and the taxi shot forward)
    An apparatus for accelerating charged particles to high velocities; a particle accelerator. (electron accelerators)

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