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

And Tuesday's launch marked a milestone in that cooperation, as NASA Administrator Jared Isaacman became the first with his title to attend a Soyuz launch in eight years. — Elizabeth Howell, Space.com, 17 July 2026

Duckworth said in an interview Thursday that the cooperation between the Navy, North Chicago and Lake County is an important step because the interests of all three are intertwined. — Steve Sadin, Chicago Tribune, 17 July 2026

The policy also says nothing in it will be construed or applied in a way that violates state or federal law requiring compliance or cooperation with lawful law enforcement activity or lawful requests for information. — Emily McLeod, CBS News, 14 July 2026

Preservation advocates and tribal representatives have criticized the changes, while suggesting that greater cooperation between the federal government and tribal leadership is required. — T. Michelle Murphy, Time, 14 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