acceleration
ac.cel.er.a.tion \ik-.sel-*-'ra--sh*n, (.)ak-\ n 1: the act or process of accelerating : the state of being accelerated 2: the time rate of change of velocity
ac.cel.er.a.tion \ik-.sel-*-'ra--sh*n, (.)ak-\ n 1: the act or process of accelerating : the state of being accelerated 2: the time rate of change of velocity