Did you know?

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

cooperate - 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.

verb [intransitive] cooperate pronunciation in British English /kəʊˈɒpəreɪt/
Word Forms
present tense
present participlecooperating
past tensecooperated
past participlecooperated
  1. 1
    to work with other people to achieve a result that is good for everyone involved

    If the proposal is sensible and reasonable they should cooperate.

    cooperate with:

    Local people decided to cooperate with the authorities against the rebels.

    cooperate in:

    The company has agreed to cooperate in the development of this technology.

  2. 2
    to do what someone asks you to do, especially by providing them with information

    They threatened to harm him if he didn’t cooperate.


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

Word of the Day


to teach someone

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