# deceleration

> English word · Noun · IPA /diːsɛləˈɹeɪʃən/ · frequency rank #40,203

## Definitions
1. The act or process of decelerating.
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.

## Etymology
From de- + (ac)celeration.

## Easily confused with
- **declaration** (https://plainspell.com/en/vs/deceleration-vs-declaration)
- **degeneration** (https://plainspell.com/en/vs/deceleration-vs-degeneration)

## Common misspellings (18)
`dceeleration`, `ddeceleration`, `decceleration`, `deceelration`, `deceleartion`, `deceleraiton`, `decelerasion`, `deceleratino`, `decelerationn`, `deceleratoin`, `decelerattion`, `decelerration`, `decelertaion`, `decelleration`, `decelreation`, `decleeration`, `deecleration`, `edceleration`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/deceleration