the act of accelerating; increase of speed or velocity.

a change in velocity.

Mechanics. the time rate of change of velocity with respect to magnitude or direction; the derivative of velocity with respect to time.

noun

the act of accelerating or the state of being accelerated

the rate of increase of speed or the rate of change of velocitySymbol: a

the power to accelerateSymbol: a

n.

1530s, from Latin accelerationem (nominative acceleratio) “a hastening,” noun of action from past participle stem of accelerare (see accelerate).

The rate of change of the velocity of a moving body. An increase in the magnitude of the velocity of a moving body (an increase in speed) is called a positive acceleration; a decrease in speed is called a negative acceleration. Acceleration, like velocity, is a vector quantity, so any change in the direction of a moving body is also an acceleration. A moving body that follows a curved path, even when its speed remains constant, is undergoing acceleration. See more at gravity relativity.