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

Critics such as economist Jeffrey Sachs have warned that the NSS is grounded in grandiosity and Machiavellianism, substituting coercion for cooperation and dominance for legitimacy. —Alejandro Reyes, Washington Post, 3 Feb. 2026

The investigation has full cooperation from the Guthrie family. —Jackie Strause, HollywoodReporter, 3 Feb. 2026

Demuth suggested House Republicans may revive legislation brought forward last year that would prohibit local governments from implementing policies or rules restricting cooperation with immigration agents. —Caroline Cummings, CBS News, 3 Feb. 2026

This story is republished in cooperation with CT Community News, a service of the Connecticut Student Journalism Collaborative, an organization sponsored by journalism departments at college and university campuses across the state. —Mikayla Bunnell, Hartford Courant, 3 Feb. 2026

Word History

Etymology

see cooperate

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for cooperation

• abbreviation
• abomination
• acceleration
• accentuation
• accommodation
• accreditation
• acculturation
• accumulation
• acetylation
• adjudication
• administration
• adulteration

Kids Definition

cooperation

noun

co·​op·​er·​a·​tion kō-ˌäp-ə-ˈrā-shən 

: the act or process of cooperating