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

Industrial incompatibilities ultimately sank the project at the heart of the Future Combat Air System (FCAS) scheme, the much-vaunted political lynchpin of Franco-German military cooperation. —Joseph Ataman, CNN Money, 13 June 2026

This story is shared in cooperation with Yale School of Medicine. —Isabella Backman, Hartford Courant, 12 June 2026

The film is being developed by Radar Pictures with the cooperation of Emerson, Lake & Palmer and the band’s management. —William Earl, Variety, 12 June 2026

Choose cooperation, and let promises become sturdy action over ego. —Tarot.com, Sun Sentinel, 12 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