acceleration

ac·cel·er·a·tion

noun \ik-ˌsel-ə-ˈrā-shən, (ˌ)ak-\

Definition of ACCELERATION

1

: the act or process of accelerating : the state of being accelerated

2

: change of velocity; also : the rate of this change

3

: advancement in mental growth or achievement beyond the average for one's age