acceleration

2.53  acceleration. Vector that specifies the time rate of change of velocity. Unit, meter per second-squared (m/s²).

Annotation 1          Various self-explanatory modifiers such as peak and time-mean-square are often used. The time interval should be indicated over which the mean (for example) was taken.

Annotation 2          Acceleration may be (a) oscillatory, in which case it may be defined by acceleration amplitude (if simple harmonic) or the time-mean-square acceleration (if random), or (b) non-oscillatory, in which case it is designated “sustained” or “transient acceleration.”