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

Mamdani stressed the high level of cooperation that surrounded the investigation and recovery. —Brady Knox, The Washington Examiner, 24 Mar. 2026

On the security front, Australia and the European bloc committed to strengthening cooperation in areas such as crisis management, maritime security, and disruptive technologies, including artificial intelligence. —Anniek Bao, CNBC, 24 Mar. 2026

Beyond nuclear energy, Monday's meeting in Moscow included discussion of expanding cooperation in oil and gas, technology and infrastructure. —ABC News, 24 Mar. 2026

But that cooperation quickly stopped after the assistant special agent in charge in the FBI's Minnesota field office ordered it to end, the lawsuit alleges. —Sarah N. Lynch, CBS News, 24 Mar. 2026

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