Acceleration

n. increase of speed

In physics, acceleration is defined as the rate of change of velocity, or, equivalently, as the second derivative of position. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in metres/second² (m·s-²). The term "acceleration" generally refers to the change in instantaneous velocity.
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Acceleration, n in osteopathy, the process of increasing speed or velocity of a manipulative technique. [more]Acceleration - Community and Resources

Noun
1. an increase in speed; "modern science caused an acceleration of cultural change"
(antonym) deceleration, slowing, retardation
(hypernym) speed, swiftness, fastness
(hyponym) pickup, getaway
(derivation) accelerate, speed, speed up
2. the act of accelerating; increasing the speed
(synonym) quickening, speedup
(hypernym) speed, speeding, hurrying
(derivation) accelerate, speed, speed up
3. (physics) a rate of change of velocity
(hypernym) rate
(hyponym) centripetal acceleration
(classification) physics, physical science, natural philosophy

n. acceleration; hurry, quickening, speed up, haste; expedition; hastiness