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

Baghaei said the visit aims to strengthen bilateral cooperation between Iran and Pakistan and continue Pakistan’s work to promote peace and security in the region. — ABC News, 23 Aug. 2026

Such a move would mark a significant expansion of Moscow and Pyongyang’s military cooperation and comes as Ukraine is running painfully short of air defenses. — Nick Paton Walsh, CNN Money, 21 Aug. 2026

Both restrict state and local law enforcement cooperation with federal immigration authorities like ICE. — Dennis Valera, CBS News, 21 Aug. 2026

To force Davis’ cooperation, Dupree said investigators gathered evidence that Davis, now 63, had sold a large quantity of PCP through his home, exposing him to a potential life sentence and leaving his family open to charges. — Richard Winton, Los Angeles Times, 21 Aug. 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