decelerate
C1Formal/Technical; common in physics, engineering, economics, driving instruction, and academic contexts.
Definition
Meaning
to reduce speed or rate of progress; to slow down
Can describe physical slowing, economic cooling, or reduced pace in processes like learning or project development. Often implies a controlled, intentional reduction in velocity.
Linguistics
Semantic Notes
Typically transitive (to decelerate something) but can be intransitive (the vehicle decelerated). Implies an active process rather than a passive state. More specific and technical than "slow down".
Dialectal Variation
British vs American Usage
Differences
Usage frequency is similar. British English may slightly prefer "slow down" in everyday contexts, while American English retains "decelerate" equally in technical/motor contexts.
Connotations
Neutral-technical in both varieties. No significant regional connotative difference.
Frequency
Medium-low in general corpus; higher in technical/scientific sub-corpora.
Vocabulary
Collocations
Grammar
Valency Patterns
[NP] decelerated[NP] decelerated [NP][NP] caused [NP] to decelerateVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “put the brakes on (figurative equivalent)”
- “take one's foot off the gas”
Usage
Context Usage
Business
The central bank's policies aim to decelerate inflation without causing a recession.
Academic
The experiment required the particles to decelerate to near-rest velocities.
Everyday
You need to decelerate before entering the sharp bend.
Technical
The thrust reversers help decelerate the aircraft upon landing.
Examples
By Part of Speech
verb
British English
- The lorry began to decelerate as it approached the roundabout.
- Economic growth is expected to decelerate next quarter.
American English
- The driver decelerated before exiting the highway.
- The Fed's action should decelerate price increases.
Examples
By CEFR Level
- The train started to decelerate.
- Please decelerate when you see the sign.
- The company had to decelerate its expansion plans due to market conditions.
- Pilots must decelerate the aircraft gradually for passenger comfort.
- Monetary tightening is intended to decelerate the overheated economy without triggering a hard landing.
- The spacecraft fired its retro-rockets to decelerate for orbital insertion.
Learning
Memory Aids
Mnemonic
Think of the prefix 'de-' meaning 'down' or 'reverse', and 'celer' from Latin for 'swift' (like 'celerity'). So, to decelerate is to reverse swiftness.
Conceptual Metaphor
PROGRESS IS FORWARD MOTION; therefore, reducing progress is DECELERATION.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with "децелерация" (rare in Russian) or "замедлить" (more common). Avoid using where "притормозить" or "сбавить скорость" is more natural in everyday speech.
Common Mistakes
- Using as a direct opposite of 'celebrate'.
- Using intransitively where an object is needed (e.g., 'He decelerated the car' is better than 'He decelerated' if context unclear).
- Misspelling as 'deselerate'.
Practice
Quiz
In which context is 'decelerate' LEAST appropriate?
FAQ
Frequently Asked Questions
Yes, it is more formal and technical than 'slow down'. It's common in scientific, economic, and instructional contexts.
Yes, it can be intransitive (e.g., 'The economy decelerated') or transitive (e.g., 'He decelerated the car').
'Decelerate' is more precise and technical, often implying a measured reduction in speed or rate. 'Slow down' is more general and colloquial.
Yes, 'deceleration' (e.g., 'rapid deceleration').