decelerate

verb

de·​cel·​er·​ate (ˌ)dē-ˈse-lə-ˌrāt How to pronounce decelerate (audio)
decelerated; decelerating

transitive verb

1
: to reduce the speed of : slow down
decelerate a car
2
: to decrease the rate of progress of
decelerate growth
decelerate soil erosion

intransitive verb

: to move at decreasing speed
deceleration noun
decelerator noun

Examples of decelerate in a Sentence

she decelerated the car as we entered the school zone
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Growth decelerated from double-digit annual rates two decades ago to rates in the high single digits in the 2010s to rates of around five percent today (discounted by many China watchers to closer to two percent, to account for the CCP’s tendency to exaggerate). Zongyuan Zoe Liu, Foreign Affairs, 29 Apr. 2025 The Future: Balanced Expectations As retail media’s rapid growth begins to decelerate, artificial intelligence emerges not as a silver bullet, but as a strategic tool to address the industry's most pressing challenges. Kiri Masters, Forbes.com, 24 Apr. 2025 Abercrombie brand sales continued to decelerate into February and turned negative for the month, CEO Fran Horowitz said on a call with analysts. Gabrielle Fonrouge, CNBC, 5 Mar. 2025 Material handling and manufacturing industry data expanded but decelerated in February 2025. Jason Schenker, Forbes, 4 Mar. 2025 See All Example Sentences for decelerate

Word History

Etymology

de- + accelerate

First Known Use

1899, in the meaning defined at transitive sense 1

Time Traveler
The first known use of decelerate was in 1899

Cite this Entry

“Decelerate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/decelerate. Accessed 4 May. 2025.

Kids Definition

decelerate

verb
de·​cel·​er·​ate (ˈ)dē-ˈsel-ə-ˌrāt How to pronounce decelerate (audio)
decelerated; decelerating
: to move or cause to move at decreasing speed : slow down
deceleration noun

Medical Definition

decelerate

verb
de·​cel·​er·​ate (ˈ)dē-ˈsel-ə-ˌrāt How to pronounce decelerate (audio)
decelerated; decelerating

transitive verb

: to reduce the speed of : slow down

intransitive verb

: to move at decreasing speed
deceleration noun

More from Merriam-Webster on decelerate

Last Updated: - Updated example sentences
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