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

The Justice Department’s antitrust division was briefly instructed to pause cooperation with Canadian authorities this week, as trade tensions continue to escalate between the two countries. — Rena Rowe, The Washington Examiner, 5 Sep. 2026

Such cooperation is increasingly important as the United States and its allies seek to improve interoperability and maintain credible airpower across the Indo-Pacific. — Prabhat Ranjan Mishra, Interesting Engineering, 4 Sep. 2026

One factor in the harsh penalty for the Clippers seems to be that their cooperation and truthfulness seemed, based on the Wachtell report, something short of optimal, particularly in Zucker’s case. — John Hollinger, New York Times, 3 Sep. 2026

In February, Brazil and India signed a nonbinding memorandum of understanding on critical minerals and rare earths, enhancing cooperation on crucial resources between both countries. — ABC News, 3 Sep. 2026

Word History

Etymology

see cooperate

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for cooperation

• abdication
• aberration
• abjuration
• abnegation
• abrogation
• acceptation
• acclamation
• acclimation
• accusation
• activation
• actuation
• acylation

Kids Definition

cooperation

noun

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

: the act or process of cooperating