co·op·er·ate | \ kō-ˈä-pə-ˌrāt \
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 \ 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

Indeed, in the months to come, George Papadopoulos – one of then-candidate Trump's volunteer foreign policy advisers who is now cooperating with Mueller's probe – also sought a meeting with Yakovenko., "How the 'Bad Boys of Brexit' forged ties with Russia and the Trump campaign and came under scrutiny," 29 June 2018 But these are surmountable challenges; all the pieces are there for a run deep into October, if the baseball gods cooperate this time. Jack Dickey,, "Midseason Report Card: Red Sox, Yankees Continue to Control the AL East," 29 June 2018 The five who have pleaded guilty include Michael T. Flynn, Trump’s first national security advisor, who admitted to lying to investigators and is cooperating with Mueller’s team. David Willman,, "Giuliani: Trump may pardon targets of special counsel if he thinks they 'have been treated unfairly'," 17 June 2018 Police contacted the guests, who cooperated with authorities, according to the newspaper. Crystal Hill, miamiherald, "Hotel workers ate chocolate left behind by guests. But it wasn’t regular candy, Vermont police say," 13 June 2018 Two weeks ago, Budi texted the agent the Charlotte address of a friend of his from college who was cooperating with the FBI, the affidavit states. Michael Gordon, charlotteobserver, "He hired a hit man, then bought radioactive material to put on enemy's food, Feds say," 4 June 2018 Still, the civil lawsuit could provide a platform for the five former players and students, who cooperated with Chandler police and the County Attorney's Office, to have their stories be heard in court. Uriel J. Garcia, azcentral, "Civil suit claims Hamilton High coach knew about sexual abuse between players," 16 May 2018 There were clues throughout the documents that the transaction was not entirely legitimate, said Singer, who is cooperating with police in the investigation. Wayne K. Roustan,, "Seven accused of taking homes worth $12 million from the living and the dead," 9 May 2018 There was no indication the driver, who cooperated with the investigation, was impaired or intoxicated, Chandler said. Hudson Sangree, sacbee, "Bicyclist killed by driver on Arden Way identified as 31-year-old Sacramento man | The Sacramento Bee," 7 May 2018

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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Statistics for cooperate

Last Updated

17 Sep 2018

Look-up Popularity

Time Traveler for cooperate

The first known use of cooperate was in 1582

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More Definitions for cooperate



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 \
cooperated; cooperating

Kids Definition of cooperate

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

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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).


a magnificent or impressive array

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