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

Spanish authorities thanked Morocco’s government for their cooperation in returning migrants to the North African country. — Michael Loria, USA Today, 1 Aug. 2026

The exercises are designed to help Davis’ first responders improve coordination and cooperation during critical incidents. — Daniel Lempres, Sacbee.com, 31 July 2026

That cooperation was also seen in recent joint Russia-China naval drills, and in North Korea sending troops to fight in the Russia-Ukraine war. — Jessie Yeung, CNN Money, 31 July 2026

The forensic analysis of nuclear fallout requires cooperation between a host of US agencies ranging from the Federal Bureau of Investigation (FBI), to the Department of Energy (DOE), the Department of War, among others. — Ameya Paleja, Interesting Engineering, 31 July 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