deceleration

noun

de·​cel·​er·​a·​tion (ˌ)dē-ˌse-lə-ˈrā-shən 

plural -s

1

: the act or process of decelerating

deceleration of a truck by braking

deceleration of an aging process

2

: the rate of decrease in velocity

aeromedical research has shown that people can withstand high decelerations

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