Did you know?

Click any word in a definition or example to find the entry for that word

acceleration - definition and synonyms


What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

noun acceleration pronunciation in British English /əkˌseləˈreɪʃ(ə)n/
  1. 1
    [singular/uncountable] an increase in the rate at which something happens, changes, or grows
    Economic growth slowed down sharply after three months of acceleration.
    acceleration of: The report calls for an acceleration of reforms in the prison service.
  2. 2
    [uncountable] the power of a vehicle to increase its speed
    a sports car with impressive acceleration
  3. 3
    [uncountable] science the increase in speed of a moving object


… a feeling of pleasure you get from spending time doing what you want and not worrying about what other people are doing or saying

BuzzWord Article

Word of the Day

Mardi Gras

shrove tuesday

Open Dictionary

brain fade

a temporary inability to think clearly or remember information

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog