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

The administration is stripping legal protections from migrants and expanding local law enforcement cooperation, incorporating immigration checks into routine traffic stops and jail procedures. —Rebecca Santana, Los Angeles Times, 1 May 2026

Israeli officials say the war has pushed security cooperation between the two countries to unprecedented levels. —Tal Shalev, CNN Money, 1 May 2026

Natural selection could have increasingly favored those better at cooperation, communication, and conflict resolution. —Literary Hub, 1 May 2026

Agreements have meant interagency cooperation and calling upon of resources belonging to state and federal agencies by local fire departments. —Alan Gionet, CBS News, 30 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