accelerator

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ac|cel|era|tor /æks'eləreɪtər/ (accelerators)
[N-COUNT]
The accelerator in a car or other vehicle is the pedal which you press with your foot in order to make the vehicle go faster.
He eased his foot off the accelerator.par|ti|cle ac|cel|era|tor (particle accelerators)
[N-COUNT]
A particle accelerator is a machine used for research in nuclear physics which can make particles that are smaller than atoms move very fast.

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allowance

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