Did you know?

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

cooperation - 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 [uncountable] cooperation pronunciation in British English /kəʊˌɒpəˈreɪʃ(ə)n/

Related words

  1. 1
    a situation in which people or organizations work together to achieve a result that will benefit all of them

    A working group will be established to promote cooperation.

    cooperation between:

    economic cooperation between the two countries

    cooperation with:

    Their duties involved close cooperation with the prince.

  2. 2
    help that you give someone

    We are grateful for the cooperation of the police.

    Synonyms and related words

sea lion

in an online conversation, repeatedly asking a person questions which suggest that you are interested in what they are talking about, but are actually intended to annoy them

BuzzWord Article

Open Dictionary


an electric skateboard

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
Macmillan learn live love play