1. n.[U] The acceleration of a process or change is the fact that it is getting faster and faster.加快;增速
2. n.[U] Acceleration is the rate at which a car or other vehicle can increase its speed, often seen in terms of the timethat it takes to reach a particular speed.(汽车等的)加速能力,加速幅度
3. n.[U] Acceleration is the rate at which the speed of an object increases.加速度