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Longman Dictionary of Contemporary English
▪ A rapid acceleration took place in the implementation of the agrarian reform.
▪ The rapid acceleration of prices was the result of the interaction of a number of developments.
▪ But over the last decade there has been a rapid acceleration in this type of transaction.
▪ a sharp acceleration in the job market
▪ Looking ahead, bankers do not foresee any acceleration of loan growth.
▪ The acceleration by Earth's gravity acts on asteroids falling through the atmosphere.
▪ The Quattro offers excellent braking and acceleration after warming up.
▪ But London won enough of the ball for Carling to display his acceleration and his priceless ability to time a pass.
▪ During a quake of magnitude 6.1 on 20 February 1990, ground acceleration was measured at 10 percent of gravity.
▪ Eliminating F from the last two equations gives the acceleration.
▪ Finally he hooks his belt on to the Doom Diver Catapult and braces himself for sudden acceleration.
▪ Lateral acceleration at release is 6-7g.
▪ On the left-hand sides are the well-known expressions for the radial and tangential components of acceleration.
▪ The flight data recorder measures altitude, speed and acceleration of the aircraft at the time of an accident.
The Collaborative International Dictionary

Acceleration \Ac*cel`er*a"tion\, n. [L. acceleratio: cf. F. acc['e]l['e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity; -- opposed to retardation.

A period of social improvement, or of intellectual advancement, contains within itself a principle of acceleration.
--I. Taylor. [1913 Webster] (Astr. & Physics.)

Acceleration of the moon, the increase of the moon's mean motion in its orbit, in consequence of which its period of revolution is now shorter than in ancient times.

Acceleration and retardation of the tides. See Priming of the tides, under Priming.

Diurnal acceleration of the fixed stars, the amount by which their apparent diurnal motion exceeds that of the sun, in consequence of which they daily come to the meridian of any place about three minutes fifty-six seconds of solar time earlier than on the day preceding.

Acceleration of the planets, the increasing velocity of their motion, in proceeding from the apogee to the perigee of their orbits.

Douglas Harper's Etymology Dictionary

1530s, from Latin accelerationem (nominative acceleratio) "a hastening," noun of action from past participle stem of accelerare "to hasten, quicken" (see accelerate).


n. 1 (context uncountable English) The act of accelerating, or the state of being accelerated; increase of motion or action; as opposed to retardation or deceleration. 2 (context countable English) The amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity). 3 (context physics English) The change of velocity with respect to time (can include deceleration or changing direction). 4 The advancement of students at a rate that places them ahead of where they would be in the regular school curriculum.

  1. n. an increase in speed; "modern science caused an acceleration of cultural change" [ant: deceleration]

  2. the act of accelerating; increasing the speed [syn: quickening, speedup]

  3. (physics) a rate of change of velocity


Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. The SI unit for acceleration is metre per second squared Accelerations are vector quantities (they have magnitude and direction) and add according to the parallelogram law. As a vector, the calculated net force is equal to the product of the object's mass (a scalar quantity) and its acceleration.

For example, when a car starts from a standstill (zero relative velocity) and travels in a straight line at increasing speeds, it is accelerating in the direction of travel. If the car turns, there is an acceleration toward the new direction. In this example, we can call the forward acceleration of the car a "linear acceleration", which passengers in the car might experience as a force pushing them back into their seats. When changing direction, we might call this "non-linear acceleration", which passengers might experience as a sideways force. If the speed of the car decreases, this is an acceleration in the opposite direction from the direction of the vehicle, sometimes called deceleration. Passengers may experience deceleration as a force lifting them forwards. Mathematically, there is no separate formula for deceleration: both are changes in velocity. Each of these accelerations (linear, non-linear, deceleration) might be felt by passengers until their velocity (speed and direction) matches that of the car.

Acceleration (album)

Acceleration is the first full-length album by Norwegian avant-garde progressive metal band Age of Silence. It was released on September 14, 2004.

Acceleration (education)
Acceleration (differential geometry)

In mathematics and physics, acceleration is the rate of change of velocity of a curve with respect to a given linear connection. This operation provides us with a measure of the rate and direction of the "bend".

Acceleration (disambiguation)

Acceleration, in physics, is the rate at which the velocity of a body changes over time.

Acceleration may also refer to:

  • Acceleration (differential geometry), is the rate of change of velocity of a curve with respect to a given linear connection.
  • Academic acceleration, the rapid advancement of students.
  • Cardiotocographic acceleration, an apparent abrupt increase in fetal heart rate.
  • Acceleration, Human development (biology)
  • Vehicular acceleration, usually controlled by a throttle such as an accelerator pedal in a car.
  • The sensation of a change in speed.
  • Series acceleration

Usage examples of "acceleration".

Kelly was busy running an acceleration recompute when the update for this particular maneuver came in, so I took over the computer and input the change.

We need an inertia-less drive so that we can stand that acceleration without being squashed to a mush.

The bigger the acceleration that the drives produce, the closer to the disk we move the living-capsule up the central column here.

The disk pulled us towards it at twenty-one gee, the acceleration of the ship pulled us away from it at twenty gee, and we sat there in the middle at a snug and comfortable standard gravity.

We sat there, furious and not looking at each other, as the acceleration was slowly throttled back and the capsule moved away from the disk to resume its free-flight position two hundred and fifty meters behind it.

Closest approach distances for every body within five hundred AU, assuming McAndrew held the same course and acceleration all the way out.

We had both ships under one gee acceleration drives, complicated by the combined attraction of the two mass plates.

Jasper, she ignited her thrusters and her stomach settled as acceleration gripped her.

Carefully, he swung onto the downdeck ladder and climbed down three levels, feeling the increased acceleration in his thighs.

Moments later the subdued whistle of the engines faded and Dane could hear the structure of the ship creak around them as acceleration ceased.

Miraculously unbroken despite the changes in acceleration, its weight was impossible to guess in the microgravity of the ship, but its mass was pleasing.

Cofort rose and made to follow, her graceful form showing no sign of the high acceleration, but when she paused to glance back, Jellico gave in to impulse and stayed her with a gesture.

She tried to ignore the dizzying perspective plucking at her peripheral vision over the low sides of the pod and concentrated instead on the stress and acceleration vectors graphically represented on her screen.

She flexed the controls, watching the moire patterns of stress and acceleration shift, trying to correlate them with what she was feeling.

Tooe, its wasteful, almost pretentious insistence on nonexistent acceleration, with almost half her space sacrificed to a cramped up-down orientation.