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accelerator

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

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Word of the Day

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    Idiom of the Day

    clear of (something)
    to be not touching something
    We checked that the ladder was clear of the electrical wires before we painted the house.



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