ac ‧ cel ‧ e ‧ rate /əkˈseləreɪt/ BrE AmE verb
[ Date: 1500-1600 ; Language: Latin ; 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
2 . [intransitive] if a vehicle or someone who is driving it accelerates, it starts to go faster OPP decelerate :
The car accelerated smoothly away.