cooperation

noun

co·​op·​er·​a·​tion (ˌ)kō-ˌä-pə-ˈrā-shən 

1

: the actions of someone who is being helpful by doing what is wanted or asked for : common effort

We are asking for your full cooperation.

2

: association of persons for common benefit

established trade and economic cooperations

cooperationist

(ˌ)kō-ˌä-pə-ˈrā-sh(ə-)nist 

noun

Synonyms

• partnership
• collaboration
• association
• relationship
• affiliation

Examples of cooperation in a Sentence

The report cited a lack of cooperation between state and local officials.

Thank you for your cooperation.

We are asking for your full cooperation.

Recent Examples on the Web

The navies of Iran, Russia and China are holding military drills off the coast of Iran this week in a bid to boost cooperation, according to Iranian media. —Amira El-Fekki‎, MSNBC Newsweek, 21 July 2025

The two reportedly discussed cooperation ranging from joint counterterrorism initiatives to economic investment and infrastructure. —Jack Rosen, New York Daily News, 21 July 2025

In May, the county board removed a provision which had allowed limited police cooperation with ICE, including in cases involving terrorism, gangs, or felony arrests). —Michael Dorgan , Griff Jenkins, FOXNews.com, 17 July 2025

Three American astronauts and two Russian (then Soviet) cosmonauts met up for just under two days of joint operations, setting the stage for future cooperation in space. —Robert Z. Pearlman, Space.com, 17 July 2025

Word History

Etymology

see cooperate

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for cooperation

• abbreviation
• abomination
• acceleration
• accentuation
• accommodation
• accreditation
• acculturation
• accumulation
• acetylation
• adjudication
• administration
• adulteration

Kids Definition

cooperation

noun

co·​op·​er·​a·​tion kō-ˌäp-ə-ˈrā-shən 

: the act or process of cooperating