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 of cooperation

• 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

An Atlanta businessman who paid millions in bribes to an executive for the charity arm of Miami-Dade County’s public hospital system was sentenced Monday to one year and nine months in prison — thanks to his cooperation with federal authorities early on in the fraud investigation. —Jay Weaver, Miami Herald, 15 Dec. 2025

According to Reuters, cooperation between the two countries has focused on defense, energy production and financial assistance. —Efrat Lachter, FOXNews.com, 11 Dec. 2025

Without Afghan cooperation or a major shift in Pakistan’s strategy, sporadic violence could spread to cities, deepening security challenges. —Amir Daftari, MSNBC Newsweek, 11 Dec. 2025

This reinventing requires cooperation between the Chapter 11 company and its creditors, as well as the court’s blessing. —Michael McCann, Sportico.com, 11 Dec. 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