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

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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.
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Recent Examples on the Web Police say Jette is cooperating with investigators. Mirna Alsharif, CNN, "Two teenagers killed by mother's boyfriend after argument over cigarette smoke escalates, police say," 5 Dec. 2019 Assistant District Attorney Juan Maldonado says the sole witness who corroborated Taylor’s account is no longer cooperating with investigators. Hannah Yasharoff, USA TODAY, "Charges dropped against Remy Ma in assault of 'Love & Hip Hop New York' castmate," 4 Dec. 2019 Vernon police said the agency is cooperating with police and a state Department of Development Services administrative review. Josh Kovner,, "Worker at Vernon vocational agency charged with sexually assaulting intellectually disabled client," 14 Nov. 2019 Singer, who became a cooperating witness for the FBI to expose his own scam, was charged with racketeering, money laundering, conspiracy and obstruction of justice, according to a criminal complaint. Minyvonne Burke, NBC News, "Former SAT/ACT test administrator pleads guilty in college admissions scandal," 13 Nov. 2019 Gates has been a cooperating witness in proceedings that grew from special counsel Robert S. Mueller III’s now concluded probe of Russian interference in the 2016 election. Rachel Weiner, Washington Post, "Roger Stone trial to resume with focus on Trump campaign and WikiLeaks," 12 Nov. 2019 Sheriff Williams said Monday that Taylor's mother, Brianna, is no longer cooperating with the investigation, and hasn't spoken to authorities since Wednesday. Victoria Albert, CBS News, "Mother becomes person of interest in 5-year-old daughter's disappearance," 11 Nov. 2019 Everyone involved was cooperating with investigators, police said. Doug Phillips,, "Tempers flare after hit-run crash, one person detained, cops say," 23 Oct. 2019 Singer has been a cooperating government witness and has pleaded guilty in the case. Fox News, "Lori Loughlin, Mossimo Giunnulli, other parents face new college admissions scandal charges," 22 Oct. 2019

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.

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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

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Time Traveler for cooperate

Time Traveler

The first known use of cooperate was in 1582

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Statistics for cooperate

Last Updated

10 Dec 2019

Cite this Entry

“Cooperate.” The Dictionary, Merriam-Webster Inc., Accessed 14 December 2019.

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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

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Comments on cooperate

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