Meaning of ACCELERATION in English

n.1 the process or act of accelerating or being accelerated.

2 an instance of this.

3 (of a vehicle etc.) the capacity to gain speed (the car has good acceleration).

4 Physics the rate of change of velocity measured in terms of a unit of time.

Etymology: F acc{eacute}l{eacute}ration or L acceleratio (as ACCELERATE)

Oxford English vocab.      Оксфордский английский словарь.