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

Bianco, a Republican and Riverside County sheriff, also backed broader cooperation. —Richard Ramos, CBS News, 17 Nov. 2025

Ukrainian President Volodymyr Zelenskyy said in a statement on Sunday that Kyiv is working to enhance its air defenses in cooperation with Western partners. —David Brennan, ABC News, 16 Nov. 2025

That, however, risks the ire of the Israelis and their cooperation in the effort, especially if the Republican president were to promise a detailed timeline of benchmarks to be met. —Sasha Rogelberg, Fortune, 16 Nov. 2025

This is significant because the Indo-Pacific (Australia, NZ, the Pacific islands) is currently a major hotspot for defense cooperation, especially under AUKUS. —Christopher McFadden, Interesting Engineering, 16 Nov. 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