automaticdeceleration
nounUK /ˌɔːtəˈmætɪk ˌdiːseləˈreɪʃən/
US /ˌɔːtəˈmætɪk ˌdiːseləˈreɪʃən/
A car slowing down by itself without the driver doing anything.
The car's automaticdeceleration kept it from hitting the car in front.
OTHER MEANINGS
2. A machine or device slowing down on its own without a person controlling it.
The escalator's automaticdeceleration made it stop gently when no one was on it.
3. A natural process of something becoming slower by itself over time.
Scientists measured the automaticdeceleration of the spinning top as it lost energy.
4. A built-in feature that reduces speed automatically to save energy or stay safe.
The train uses automaticdeceleration to arrive smoothly at each station.