The rate of change of velocity. If of increase of velocity it is
positive; if of decrease, it is negative. It can only be brought about
by the exercise of force and is used as the measure of or as determining
the unit of force. It is equal to velocity (L/T) imparted, divided by
time (T); its dimensions therefore are L/(T^2). The c. g. s. unit of
acceleration is one centimeter in one second.

[Transcriber's note: The unit of acceleration is "centimeters per second
per second."]