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 the Padres, in cooperation with the CIF San Diego Section, made the preps feel special with a full left-field scoreboard, public-address announcer and a grounds crew between games. —John Maffei, San Diego Union-Tribune, 25 Apr. 2026

But making Colorado an actuarially sound state again will take time, and some cooperation from the elements. —Aldo Svaldi, Denver Post, 24 Apr. 2026

On Wednesday, a department spokesperson told CBS News Texas the changes would ensure that policies involving cooperation with other law enforcement agencies are compatible with state and federal guidelines. —Doug Myers, CBS News, 24 Apr. 2026

The pact also calls for strengthening operational capacities of the Haiti National Police and Armed Forces of Haiti, defining cooperation protocols with the Gang Suppression Force and the reactivation of the National Commission for Disarmament, Dismantlement and Reintegration. —Jacqueline Charles, Miami Herald, 24 Apr. 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