co·​op·​er·​ate | \ kō-ˈä-pə-ˌrāt How to pronounce cooperate (audio) \
cooperated; cooperating; cooperates

Definition of cooperate

intransitive verb

1 : to act or work with another or others : act together or in compliance refused to cooperate with the police
2 : to associate with another or others for mutual benefit nations cooperating to fight terrorism

Keep scrolling for more

Other Words from cooperate

cooperator \ kō-​ˈä-​pə-​ˌrā-​tər How to pronounce cooperator (audio) \ noun

Examples of cooperate in a Sentence

It will be much easier if everyone cooperates. Several organizations cooperated in the relief efforts. The country agreed to cooperate with the other nations on the trade agreement. The mother asked the child to put on his pajamas, but the child refused to cooperate. Witnesses were willing to cooperate.
See More
Recent Examples on the Web Another hacker, Jeremy Hammond, who worked with LulzSec to expose private information from the firm Strategic Forecasting, or Stratfor, around the same time, refused to cooperate with the government and was held in contempt. Washington Post, "Justice Department broadens case against Julian Assange," 25 June 2020 Bovis agreed to plead guilty to charges honest services wire fraud and wire fraud last month and to cooperate with investigators. Megan Cassidy,, "SF permit consultant Walter Wong charged with fraud, agrees to cooperate with Justice Department," 24 June 2020 Vallow and Daybell had refused to cooperate with the investigation into the missing children and left the state, police said in December. NBC News, "'Like gasoline and fire': Former friend speaks out about Lori Vallow and Chad Daybell," 22 June 2020 As a signatory, the country has committed to use nuclear material and technology only for peaceful purposes—and to cooperate with inspectors from the International Atomic Energy Agency. ... The Editorial Board, WSJ, "Iran’s Other Nuclear Violations," 22 June 2020 They were later found in Hawaii, and despite requests from police did not cooperate and did not present the children. Steve Almasy, CNN, "Cell phone pings from Lori Vallow's late brother led investigators to the bodies of her children," 20 June 2020 Their mother, Lori Vallow, was arrested in Hawaii in February on felony abandonment charges and refused to cooperate with investigators. Arluther Lee, ajc, "Idaho stepfather charged in missing children case," 16 June 2020 The Trump administration told the Ninth Circuit that Congress, in enacting immigration laws, expected that states would cooperate with the federal government. Adam Liptak,, "Supreme court won’t hear case on California sanctuary law," 15 June 2020 Hall tried to tell the crowd that the department is willing to adapt and cooperate with the public. Lavendrick Smith, Dallas News, "Dallas Police Chief Hall heckled by protesters at march outside City Hall," 15 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cooperate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of cooperate

1582, in the meaning defined at sense 1

History and Etymology for cooperate

Late Latin cooperatus, past participle of cooperari, from Latin co- + operari to work — more at operate

Keep scrolling for more

Learn More about cooperate

Time Traveler for cooperate

Time Traveler

The first known use of cooperate was in 1582

See more words from the same year

Statistics for cooperate

Last Updated

28 Jun 2020

Cite this Entry

“Cooperate.” Dictionary, Merriam-Webster, Accessed 5 Jul. 2020.

Keep scrolling for more

More Definitions for cooperate


How to pronounce cooperate (audio)

English Language Learners Definition of cooperate

: to work together : to work with another person or group to do something
: to be helpful by doing what someone asks or tells you to do
: to act in a way that makes something possible or likely : to produce the right conditions for something to happen


co·​op·​er·​ate | \ kō-ˈä-pə-ˌrāt How to pronounce cooperate (audio) \
cooperated; cooperating

Kids Definition of cooperate

: to act or work together so as to get something done

Keep scrolling for more

Comments on cooperate

What made you want to look up cooperate? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!