cooperate
verb
co·op·er·ate kō-ˈä-pə-ˌrāt 
cooperated; cooperating; cooperates
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
cooperator
kō-ˈä-pə-ˌrā-tər
noun 
Synonyms
- band (together)
- collaborate
- concert
- concur
- conjoin
- conspire
- join
- league
- team (up)
- unite
See all Synonyms & Antonyms 
Example Sentences
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.
Recent Examples on the Web At the Eastern Economic Forum in Vladivostok, Russia, last week, Mr. Modi said during a virtual appearance that there is immense scope for Russia and India to cooperate on energy. 
Tripti Lahiri, WSJ, 16 Sep. 2022 Despite rising geopolitical tensions, the United States and China moved to cooperate on a key financial issue – but to build trust, action must follow words. Ann Scott Tyson, The Christian Science Monitor, 13 Sep. 2022 China and Russia also recently signed an agreement to cooperate on lunar efforts. Eric Berger, Ars Technica, 23 Aug. 2022 Perhaps the most notable of Biden’s flurry of announcements with the Saudis was an agreement signed Friday night to cooperate on a new technology to build next-generation 5G and 6G telecommunications networks in the country. Peter Baker, BostonGlobe.com, 16 July 2022 American business and government have to find a better way to cooperate on climate policy going forward. Aman Kidwai, Fortune, 1 July 2022 Likely pressing the Saudis to pump more oil; align closer with Israel; support the West's effort against Russia on Ukraine; and cooperate with other Gulf states and Israel on containing Iran. Richard Galant, CNN, 26 June 2022 Under the agreement, the land agencies and tribes are to cooperate on planning, program development, resource protection and access. Brian Maffly, The Salt Lake Tribune, 22 June 2022 This is particularly true given the need to cooperate on urgent challenges like preventing pandemics, curbing climate change, and reducing global poverty. William Hartung, Forbes, 10 June 2022 See More
Tripti Lahiri, WSJ, 16 Sep. 2022 Despite rising geopolitical tensions, the United States and China moved to cooperate on a key financial issue – but to build trust, action must follow words. Ann Scott Tyson, The Christian Science Monitor, 13 Sep. 2022 China and Russia also recently signed an agreement to cooperate on lunar efforts. Eric Berger, Ars Technica, 23 Aug. 2022 Perhaps the most notable of Biden’s flurry of announcements with the Saudis was an agreement signed Friday night to cooperate on a new technology to build next-generation 5G and 6G telecommunications networks in the country. Peter Baker, BostonGlobe.com, 16 July 2022 American business and government have to find a better way to cooperate on climate policy going forward. Aman Kidwai, Fortune, 1 July 2022 Likely pressing the Saudis to pump more oil; align closer with Israel; support the West's effort against Russia on Ukraine; and cooperate with other Gulf states and Israel on containing Iran. Richard Galant, CNN, 26 June 2022 Under the agreement, the land agencies and tribes are to cooperate on planning, program development, resource protection and access. Brian Maffly, The Salt Lake Tribune, 22 June 2022 This is particularly true given the need to cooperate on urgent challenges like preventing pandemics, curbing climate change, and reducing global poverty. William Hartung, Forbes, 10 June 2022 See More Word History
Etymology
Late Latin cooperatus, past participle of cooperari, from Latin co- + operari to work — more at operate
First Known Use
1582, in the meaning defined at sense 1
Kids Definition
cooperate
verb
co·op·er·ate kō-ˈä-pə-ˌrāt
cooperated; cooperating
: to act or work together so as to get something done
cooperated
verb
1
as in collaborated
to participate or assist in a joint effort to accomplish an end conservation groups cooperated with state authorities to find a humane way to manage the area's overpopulation of deer Synonyms & Similar Words
Relevance
- collaborated
- united
- joined
- conspired
- concurred
- concerted
- combined
- played ball
- leagued
- pulled together
- conjoined
- made common cause
- connived
- allied
- affiliated
- teamed (up)
- interfaced
- banded (together)
- confederated
- hung together
- associated
2
as in united
to form or enter into an association that furthers the interests of its members several industrialized nations cooperated in a trade agreement to reduce or eliminate tariffs Synonyms & Similar Words
- collaborated
- united
- federated
- allied
- merged
- organized
- confederated
- coalesced
- cohered
- clubbed
- closed ranks
- consolidated
- leagued
- pulled together
- converged
- associated
- joined
- conjoined
- combined
- incorporated
- affiliated
- grouped
- amalgamated
- linked
- hung together
- unionized
- banded (together)
- caballed
- tied
- ganged up
- conglomerated
- knotted
- teamed (up)
- wed
- wedded
Antonyms & Near Antonyms
- disbanded
- separated
- dissolved
- split
- parted
- severed
- broke up
- divorced
- segregated
- detached
- disengaged
- fell out
- alienated
- estranged
- sundered
- disunited