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

This story is shared in cooperation 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. —Valentina Toro, Hartford Courant, 19 June 2026

Pickard says congestion requires regional cooperation and expanded transit options. —Caroline Foreback, CBS News, 19 June 2026

But Hungary’s new government, led by Magyar and his center-right Tisza party, has pledged more constructive cooperation with the EU. —Justin Spike, Los Angeles Times, 18 June 2026

For example, the document says that the ceasefire extends to Lebanon, which would require cooperation from the Israelis, who are not a party to the agreement. —June 18, NPR, 18 June 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