Is Deceleration a Noun?

Deceleration is a slowing down: the unexpected deceleration of your car might mean that you've run out of gas. Use the noun deceleration when you talk about a gradual decrease in speed.

What does deceleration mean?

: to reduce the speed of : slow down. intransitive verb. : to move at decreasing speed.

Is deceleration a word?

Rick suggests: "Deceleration" is not actually a term in physics. It is only an English word used in common speech, meaning "a decrease in speed." The problem with this word is that some students mistake it to mean the same as negative acceleration.