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 Ukrainian leader has sought to deepen defense cooperation with other countries by offering the drone expertise his country has built up over more than four years fighting against Russia’s invasion. —ABC News, 28 May 2026

Learning to collaborate is invaluable preparation for the professional world, which demands cooperation and teamwork. —Rajiv Vinnakota, Forbes.com, 28 May 2026

The law, enacted in 2014 and then amended in 2019, allows for cooperation in criminal matters like human trafficking, child exploitation, drug and weapons trafficking, and cybercrimes. —Gayla Cawley, Boston Herald, 28 May 2026

Analysts say the White House would favor a right-wing candidate, and that a victory for either Valencia or de la Espriella would probably mean a return to closer cooperation with Washington on security policy, after relations deteriorated under Petro. —Catherine Ellis, Miami Herald, 28 May 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