deceleration
Pronunciation:
/diːsɛləˈɹeɪʃən//dɪˌsɛləˈɹeɪʃən/noun
Definitions
The act or process of decelerating.
Example: The rocket is now in deceleration.
The amount by which a speed or velocity decreases (and so a scalar quantity or a vector quantity).
Example: The brakes produce a deceleration of 10 metres per second.