acceleration

American  

[ak-sel-uh-ray-shuhn, ik-] / ækˌsɛl əˈreɪ ʃən, ɪk- /

noun

• accelerations
  plural

1. the act of accelerating; increase of speed or velocity.

2. a change in velocity.

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

---

acceleration British  

/ ækˌsɛləˈreɪʃən /

noun

1. the act of accelerating or the state of being accelerated

2. a. the rate of increase of speed or the rate of change of velocity

3. a. the power to accelerate

---

acceleration Scientific  

/ ăk-sĕl′ə-rā′shən /

1. 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.

2. See more at gravity relativity

---

acceleration Cultural  

1. A change in the velocity of an object.

---

Discover More

The most familiar kind of acceleration is a change in the speed of an object. An object that stays at the same speed but changes direction, however, is also being accelerated. (See force.)

Other Word Forms

Derived Forms

• nonacceleration
  noun
• overacceleration
  noun
• reacceleration
  noun

Inflected Forms

Nouns

• accelerations
  plural

---

Etymology

Origin of acceleration

First recorded in 1525–35, acceleration is from the Latin word accelerātiōn- (stem of accelerātiō ). See accelerate, -ion

---

Explanation

Acceleration is the act of increasing speed. When you buy a sports car, you want one that has great acceleration, so it can go from zero to 60 miles an hour in no time. Acceleration comes from the Latin word accelerationem, which means "a hastening." When you hasten, you hurry, so acceleration is a speeding-up. Maybe you are walking to an appointment and realize you will be late. You pick up your pace — that's acceleration. If the rain on a stormy day begins to come down faster, that too is acceleration. As you can see, acceleration isn't just for cars.

Example Sentences

See Examples For:

acceleration accelerations

Martin, of Oxford Economics, said the September inflation data showed acceleration outside of energy prices, a worrying sign since goods outside of energy tend to be less volatile.

From MarketWatch ● Oct. 17, 2026

This was a notable acceleration from 3.4 percent in August, in one of the last major economic reports before the November 3 vote.

From Barron's ● Oct. 14, 2026

The US firm's CEO made the announcement on social media, external, saying developers are being moved to "retool for maximum AI acceleration".

From BBC ● Oct. 13, 2026

Work published in Machine Learning with Applications in September 2026 explored another possibility: using artificial intelligence to estimate knee loading from acceleration measurements collected at the foot.

From Science Daily ● Oct. 11, 2026

I did some basic acceleration and deceleration, turned in increasingly tight circles, and even did a power-stop.

From "The Martian" by Andy Weir

For aging relatives who are still driving, family members can receive reports of sudden stops or fast accelerations as well as a notification of a crash.

From The Wall Street Journal ● Feb. 21, 2026

It included the dates of 640 trips, their start and end times, the distance driven and an accounting of any speeding, hard braking or sharp accelerations.

From New York Times ● Mar. 11, 2024

Inertial measurement unit data is processed to determine hard braking, hard accelerations and hard turns and GPS data.

From Science Daily ● Feb. 29, 2024

In a statement, the US Bureau of Economic Analysis said the increase reflects "accelerations in consumer spending, private inventory investment, and federal government spending" among other factors.

From BBC ● Oct. 26, 2023

Under extremely strong gravitational accelerations, even light is affected.

From "Cosmos" by Carl Sagan

Random Word

Spin the wheel and learn a new word!

---