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

Baltimore City Council members introduced two bills that would restrict ICE activity on city property, limit cooperation by city agencies and require plans to protect public spaces. —Chevall Pryce, Baltimore Sun, 10 Feb. 2026

When everyone pitches in, cooperation grows into enduring comfort. —Tarot.com, Hartford Courant, 10 Feb. 2026

Law enforcement sources also described a delay in local cooperation with federal investigators in the beginning stages of the investigation, with days going by before federal investigators were let into the fold. —Adam Sabes, FOXNews.com, 10 Feb. 2026

Climate cooperation was also predicted to weaken as the impacts of temperature changes reverberate. —Prashant Rao, semafor.com, 10 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