Did you know?

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


 - definitions and thesaurus

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.

adjective crucial pronunciation in British English /ˈkruːʃ(ə)l/
  1. 1
    something that is crucial is extremely important because it has a major effect on the result of something
    We believe the question being investigated by the Commission is one of crucial importance to the country.
    Anderson played a crucial role in the team’s 3–2 victory on Saturday.
    a crucial factor/element/part: Experience is, of course, a crucial factor in deciding who would be the best person for the job.
    crucial for: The money is crucial for the research.
    crucial to: Resolving this issue is crucial to making peace work.
    it is crucial (that): It is crucial that all students develop these basic skills.
    Synonyms and related words
  2. 2
    British very informal extremely good

derived word


This is crucially important.
Synonyms and related words


used to describe foods which don't contain ingredients such as wheat, dairy products etc …

BuzzWord Article

Open Dictionary

red market

the buying and selling of human organs

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