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

Honest words make cooperation much easier today. —Tarot.com, Baltimore Sun, 23 May 2026

Ada County Sheriff Matt Clifford, who fought against mandatory ICE cooperation legislation this spring, is now preparing to voluntarily sign a 287(g) agreement for the warrant service officer program with Immigration and Customs Enforcement. —Chadd Cripe. Produced With Ai Assistance, Idaho Statesman, 22 May 2026

Fairness and efficiency are not in tension; fairness enables the cooperation and trust on which economic efficiency depends. —Nick Hanauer, The Atlantic, 22 May 2026

Greater Franco-Chinese coordination in nuclear supply chains, financing, and industrial cooperation reflects a wider European search for alternatives that are neither fully dependent on American hydrocarbons nor entirely subordinate to Chinese manufacturing dominance. —Wesley Alexander Hill, Forbes.com, 22 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