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

There’s always comfort in talking to a friend and/or mentor who knows the value of building self-esteem, empathy and a greater awareness that attitude, cooperation and yes, appearance, all matter. —Phil Blair, San Diego Union-Tribune, 24 Nov. 2025

On nuclear cooperation, the US remains the partner of choice. —Faisal J. Abbas, semafor.com, 24 Nov. 2025

The exact nature of that cooperation has never been publicly divulged but likely includes early warning of Russian missile launches and real-time analysis of Russian troop movements, critical at a time when Russian forces are making advances on several parts of the frontlines. —Tim Lister, CNN Money, 23 Nov. 2025

Formed in 2003, the three-country grouping primarily coordinates on issues of global governance and promotes South-South cooperation, including through joint-funding of development projects. —Sudhi Ranjan Sen, Fortune, 23 Nov. 2025

Word History

Etymology

see cooperate

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for cooperation

• abbreviation
• abomination
• acceleration
• accentuation
• accommodation
• accreditation
• acculturation
• accumulation
• acetylation
• adjudication
• administration
• adulteration

Kids Definition

cooperation

noun

co·​op·​er·​a·​tion kō-ˌäp-ə-ˈrā-shən 

: the act or process of cooperating