# Dictionary Definition

accelerate

### Verb

# User Contributed Dictionary

## English

### Etymology

acceleratus, past participle of accelerare, formed from ad- + celerare "to hasten", which from celer "quick". See celerity.### Pronunciation

- RP:
- /əkˈsɛləˌreɪt/

### Verb

- To cause to move faster; to quicken the motion of; to add to the speed of.
- To quicken the natural or ordinary progression or process of.
- to accelerate the growth of a plant, the increase of wealth, etc.

- To hasten, as the
occurrence of an event.
- to accelerate our departure.

- To become faster; to begin to move more quickly.

#### Antonyms

#### Derived terms

#### Related terms

#### Translations

to cause to move faster

- Arabic:
- Chinese: 加速 (jiāsù)
- Czech: zrychlit
- Dutch: versnellen
- Finnish: kiihdyttää
- French: accélérer
- German: beschleunigen
- Hebrew: להאיץ (le'ha'ytz)
- Italian: accelerare
- Japanese: 加速する (かそくする, kasokusuru)
- Norwegian: akselerere
- Portuguese: acelerar
- Russian: ускорять/ускорить (uskorját’/uskórit’)
- Spanish: acelerar
- Swedish: accelerera, ge mer gas (1, about motorized vehicles), gasa (1, same as latter)
- Thai: (reng)

to quicken natural or ordinary progression or
process

- Chinese: 加速 (jiāsù); 變快, 变快 (biàn kuài)
- Czech: urychlit
- Dutch: versnellen
- Finnish: kiihdyttää
- French: accélérer
- German: beschleunigen
- Hebrew: להאיץ (le'ha'ytz)
- Italian: accelerare
- Japanese: 促進する (そくしんする, sokusinsuru)
- Norwegian: påskynde
- Portuguese: acelerar, apressar
- Russian: ускорять/ускорить (uskorját’/uskórit’)
- Spanish: acelerar
- Swedish: accelerera

to hasten

- Arabic:
- Chinese: 加速 (jiāsù); 變快, 变快 (biàn kuài)
- Dutch: bespoedigen
- Finnish: nopeuttaa
- French: accélérer
- German: eilen, (sich) beeilen
- Hebrew: לזרז (le'zarez)
- Italian: affrettare
- Norwegian: påskynde
- Portuguese: acelerar, apressar
- Russian: ускорять/ускорить (uskorját’/uskórit’)
- Spanish: acelerar, apresurar
- Swedish: påskynda

to become faster

- Arabic:
- Chinese: 變快, 变快 (biàn kuài)
- Dutch: versnellen, sneller gaan
- French: accélérer
- German: beschleunigen
- Italian: accelerare
- Japanese: 加速する (かそくする, kasokusuru)
- Norwegian: sette opp farten
- Portuguese: acelerar
- Russian: ускоряться/ускориться (uskorját’s’a/uskórit’s’a)
- Spanish: acelerarse

- ttbc Indonesian: mempercepat
- ttbc Interlingua: accelerar

## Italian

### Adjective

accelerate p### Verb

accelerate- second-person plural present tense of accelerare
- second-person plural imperative of accelerare
- feminine plural past participle of accelerare

# Extensive Definition

In physics, acceleration is defined as the
rate of
change of velocity,
or as the second derivative of position (with
respect to time). It is then a vector
quantity with dimension length/time². In SI units, acceleration
is measured in
meters/second² (m·s-2). The term "acceleration" generally
refers to the rate of change in instantaneous velocity. (velocity
is speed and direction)

In common speech, the term acceleration is only
used for an increase in speed; a decrease in speed is called
deceleration. In physics, any increase or decrease in speed is
referred to as acceleration and similarly, motion in a circle at
constant speed is also an acceleration, since the direction
component of the velocity is changing. See also Newton's
Laws of Motion.

## Relation to relativity

After completing his theory of special relativity, Albert Einstein realized that forces felt by objects undergoing constant proper acceleration are indistinguishable from those in a gravitational field. This was the basis for his development of general relativity, a relativistic theory of gravity. This is also the basis for the popular Twin paradox, which asks why one twin ages less when moving away from his sibling at near light-speed and then returning, since the non-aging twin can say that it is the other twin that was moving. General relativity solved the "why does only one object feel accelerated?" problem which had plagued philosophers and scientists since Newton's time (and caused Newton to endorse absolute space). In special relativity, only inertial frames of reference (non-accelerated frames) can be used and are equivalent; general relativity considers all frames, even accelerated ones, to be equivalent. (The path from these considerations to the full theory of general relativity is traced in the Introduction to general relativity.)## Formula

The formula for the average acceleration over a time period \Delta t is- \mathbf=\frac

- \mathbf(t+\Delta t) is the final velocity
- \mathbf(t) is the initial velocity
- \mathbf is the initial time and \Delta \mathbf is the change in time

The formula for the instantaneous acceleration at
time t is

- \mathbf(t)=\lim_\frac=\frac

One should also note that the average and
instantaneous accelerations over a time period \Delta t=t_1-t_0 are
related through the Mean
Value Theorem for Integrals:

- \bar\int_^\mathrmt=\int_^\mathbf(t)\mathrmt

Putting it all together means:

- \mathbf = \frac = \frac

- \mathbf is acceleration
- \mathbf is velocity
- \mathbf is position
- is time

## See also

## External links

- Acceleration and Free Fall - a chapter from an online textbook
- Trajectories and Radius, Velocity, Acceleration on Project PHYSNET (ERROR - PAGE MOVED)
- Science aid: Movement
- Physics Classroom: Acceleration
- Science.dirbix: Acceleration
- Acceleration Calculator
- Motion Characteristics for Circular Motion

accelerate in Afrikaans: Versnelling

accelerate in Arabic: تسارع

accelerate in Asturian: Aceleración

accelerate in Bengali: ত্বরণ

accelerate in Min Nan: Ka-sok-tō͘

accelerate in Belarusian: Паскарэнне

accelerate in Bosnian: Ubrzanje

accelerate in Bulgarian: Ускорение

accelerate in Catalan: Acceleració

accelerate in Czech: Zrychlení

accelerate in Welsh: Cyflymiad

accelerate in Danish: Acceleration

accelerate in German: Beschleunigung

accelerate in Estonian: Kiirendus

accelerate in Modern Greek (1453-):
Επιτάχυνση

accelerate in Spanish: Aceleración

accelerate in Esperanto: Akcelo

accelerate in Basque: Azelerazio

accelerate in Persian: شتاب

accelerate in French: Accélération

accelerate in Irish: Luasghéarú

accelerate in Manx: Bieauaghey

accelerate in Galician: Aceleración

accelerate in Hakka Chinese: Kâ-suk-thu

accelerate in Korean: 가속도

accelerate in Croatian: Ubrzanje

accelerate in Ido: Acelero

accelerate in Indonesian: Percepatan

accelerate in Icelandic: Hröðun

accelerate in Italian: Accelerazione

accelerate in Hebrew: תאוצה

accelerate in Latin: Acceleratio

accelerate in Latvian: Paātrinājums

accelerate in Lithuanian: Pagreitis

accelerate in Hungarian: Gyorsulás

accelerate in Malayalam: ത്വരണം

accelerate in Malay (macrolanguage):
Pecutan

accelerate in Mongolian: Хурдатгал

accelerate in Dutch: Versnelling
(natuurkunde)

accelerate in Japanese: 加速度

accelerate in Norwegian: Akselerasjon

accelerate in Norwegian Nynorsk:
Akselerasjon

accelerate in Novial: Akseleratione

accelerate in Polish: Przyspieszenie

accelerate in Portuguese: Aceleração

accelerate in Quechua: P'ikwachiy

accelerate in Russian: Ускорение

accelerate in Sicilian: Accilirazzioni

accelerate in Simple English: Acceleration

accelerate in Slovak: Zrýchlenie

accelerate in Slovenian: Pospešek

accelerate in Serbian: Убрзање

accelerate in Serbo-Croatian: Ubrzanje

accelerate in Finnish: Kiihtyvyys

accelerate in Swedish: Acceleration

accelerate in Telugu: త్వరణము

accelerate in Thai: ความเร่ง

accelerate in Vietnamese: Gia tốc

accelerate in Turkish: İvme

accelerate in Ukrainian: Прискорення

accelerate in Chinese: 加速度

# Synonyms, Antonyms and Related Words

activate, aggravate, atomize, beef up, blow up,
bombard, bundle, bustle, cleave, complicate, concentrate, condense, consolidate, crack on,
cross-bombard, crowd,
deepen, dispatch, double, drive, drive on, enhance, exacerbate, exaggerate, expedite, fission, forward, gain ground, get going,
haste, hasten, hasten on, heat up,
heighten, hie on, hop
up, hot up, hurry, hurry
along, hurry on, hurry up, hustle, hustle up, impel, intensify, jazz up, key up,
magnify, make complex,
nucleize, open the
throttle, pick up speed, precipitate, press, push, push on, push through, put
on, put on steam, quicken, race, railroad through, ramify, redouble, reinforce, rev, rush, rush along, shake up,
sharpen, smash the atom,
soup up, speed, speed
along, speed up, spur,
stampede, step on it,
step up, strengthen,
triple, urge, whet, whip, whip
along