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

Lawmakers in New Mexico also cited the intense immigration enforcement efforts in Minnesota as a reason to limit cooperation with ICE. —David A. Lieb, Los Angeles Times, 18 Feb. 2026

The direct meeting with Grossi is a significant step after Iran suspended all cooperation with the IAEA following the 12-day war in June with Israel. —Arkansas Online, 17 Feb. 2026

Without the guarantee of American cooperation and NATO protection, the EU is newly vulnerable. —Joseph De Weck, The Atlantic, 17 Feb. 2026

In a 2019 memoir, Davis detailed his rise in the South Side Crips and acknowledged signing a federal cooperation agreement tied to a drug case in Los Angeles. —Nancy Dillon, Rolling Stone, 17 Feb. 2026

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