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

the bank will have its foot on the accelerator until the economy starts to recover

an apparatus for accelerating charged particles to high velocities; a particle accelerator

electron accelerators