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

Thanks to aggressive American anti-drug operations and cooperation from Mexico, scores of top-level cartel figures have been sent to US custody in the past two years. — Mary Beth Sheridan, CNN Money, 25 July 2026

In recent years, the two countries have expanded defence cooperation through joint military exercises, pilot training, cybersecurity initiatives and counter-drone technology development. — Prabhat Ranjan Mishra, Interesting Engineering, 25 July 2026

Saudi officials have previously resisted linking nuclear cooperation to recognition of Israel. — Arion McNicoll, TheWeek, 24 July 2026

Participation in the Costa Rica Media Market is part of IBEROFIC’s expansion strategy, which seeks to strengthen regional cooperation, drive new co-productions, and consolidate the development of film commissions. — Rafa Sales Ross, Variety, 24 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