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Definitions from WordNet

Noun deceleration has 1 sense
  1. deceleration, slowing, retardation - a decrease in speed; "the deceleration of the arms race"
    --1 is a kind of speed, swiftness, fastness
    Antonyms: acceleration
    Derived forms: verb decelerate2, verb decelerate1

Definitions from the Web



1. The act or process of slowing down or reducing speed.

Example sentence: The car's deceleration was sudden and jerky, causing the passengers to be thrown forward.

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2. Physics: The negative acceleration of an object, i.e., when an object's velocity decreases over time.

Example sentence: The deceleration of the spaceship before landing was carefully controlled to ensure a soft touchdown.

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1. To slow down or reduce speed.

Example sentence: The driver had to decelerate on the slippery road to avoid skidding.

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