deceleration

باللغة العربية: تَباطُؤ

1. The act or process of decelerating. (uncountable) · The rocket is now in deceleration.
2. The amount by which a speed or velocity decreases (and so a scalar quantity or a vector quantity), an acceleration having a negative numerical value. (countable) · The brakes produce a deceleration of 10 metres per second.

الجمع decelerations