|Origin:||, past participle of accelerare, from ad- 'to' + celer 'fast'|
1 [intransitive and transitive]
if a process accelerates or if something accelerates it, it happens faster than usual or sooner than you expect:
measures to accelerate the rate of economic growth
if a vehicle or someone who is driving it accelerates, it starts to go faster [≠ decelerate]:
The car accelerated smoothly away.