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

Keep scrolling for more

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.
See More

Recent Examples on the Web

The men, Paras Jha, 22, of Fanwood, New Jersey; Josiah White, 21, of Washington, Pennsylvania; and Dalton Norman, 22, of Metairie, Louisiana, will continue to cooperate with the FBI. Cyrus Farivar, Ars Technica, "Mirai botnet creators praised for helping FBI, won’t serve prison time," 19 Sep. 2018 This is the president of the US calling a witness who is cooperating w/his own DOJ a rat. Aaron Rupar, Vox, "James Comey unloads on House Republicans and Fox News," 17 Dec. 2018 Suspected of either receiving or disseminating child pornography, 28-year-old Columbus, Ohio resident Grant Michalski cooperated with the FBI when asked to unlock his phone via Face ID. Sam Blum, Popular Mechanics, "FBI Unlocks a Suspect's iPhone Using His Face," 1 Oct. 2018 Fanny Lorenzo, a legal resident of the United States, committed a crime 20 years ago, admitting to her role in her husband’s marijuana growing operation and cooperating with prosecutors. Dan Sweeney,, "Deport immigrants who commit crimes, readers say, regardless of legal status or how old the crime is," 10 July 2018 Lorenzo pleaded guilty, cooperated with prosecutors and successfully served five years of probation. David Ovalle, miamiherald, "Feds decided to deport her — two decades after her Miami marijuana arrest," 5 July 2018 Holmes is not cooperating with police, Tuggle said. Lauren Lumpkin,, "7-year-old shot remains in critical condition; police arrest driver of car on possession, drug charges," 6 July 2018 The investigation into the fight stalled days after the brawl occurred because witnesses were not cooperating, Cooper said in April. Vic Ryckaert, Indianapolis Star, "18 people to be charged with misdemeanors in Sikh temple brawl," 2 July 2018 The gunman, a Maryland resident identified as Jarrod Ramos, 38, has been taken into custody and is currently being questioned but is not cooperating with authorities. Tonya Alanez,, "South Florida's Rob Hiaasen, novelist Carl Hiaasen's brother, killed in newsroom shooting," 29 June 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.

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

Statistics for cooperate

Last Updated

19 Feb 2019

Look-up Popularity

Time Traveler for cooperate

The first known use of cooperate was in 1582

See more words from the same year

Keep scrolling for more

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

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).


excited commotion or publicity

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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!