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Syllabification: de·cel·er·ate
Pronunciation: /dēˈseləˌrāt

Definition of decelerate in English:


[no object]
1(Of a vehicle, machine, or process) reduce speed; slow down: international growth rates decelerated in the early 1970s
More example sentences
  • In the meantime, the real GDP rate of growth decelerated sharply in Q4.
  • Coronary heart disease mortality in women from both countries increased with age, and in both countries the death rate in men decelerated at older ages, reducing the magnitude of the sex difference.
  • Four minutes and 45 seconds after liftoff the capsule will begin decelerating by extending a set of speed brakes located near the nose of the capsule.
slow down, slow up, ease up, slack up, reduce speed, brake
1.1 [with object] Cause to move more slowly: gravity decelerates the cosmic expansion
More example sentences
  • Regions slightly denser than average would have been decelerated more by gravity.
  • In the Friedmann models, the expansion is decelerated by an amount depending on how much matter there is in the Universe.
  • In their experiment the physicists first decelerated caesium atoms so that they were scarcely moving.


late 19th century: from de- (expressing removal) + a shortened form of accelerate.



Pronunciation: /-ˌseləˈrāSHən/
Example sentences
  • This marked deceleration was due to several factors, including weak domestic demand, lower industrial activity and lower unit values of imports.
  • Its last results were a little disappointing, largely because of the reduced market expectations following the rapid deceleration in US demand.
  • To maximize the car's performance in terms of acceleration, deceleration and hill-climbing, the team made it out of aluminum.


Pronunciation: /-ˌrātər/
Example sentences
  • 300 reflective cones and 200 reflective rubber decelerators, which are detachable speed breakers normally used during VVIP and VIP convoys have also been provided.
  • With the advent of 3D accelerators (the first of which were really more ‘decelerators’), the video memory was burdened with the additional task of buffering the 3D data.
  • The Army designed the AGU and the parachute decelerators, while the Air Force created the JPADS mission planner (JPADS-MP).


Pronunciation: /-ˌseləˈrämitər/
Example sentences
  • Truck Trailer Transit carries a complete line of brake decelerometers to meet your individual needs.
  • The decelerometers were to be fitted as integral components within the goods vehicle seat-belt sleds.
  • A truck outfitted with a decelerometer locks its brakes several times as it drives down the main North Bay runway.

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