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

During the congress, Kim would likely strengthen a policy of cooperation with Russia, China and other nations to bring out gradual economic developments, Kwak said. —CNN Money, 21 Jan. 2026

China promotes cooperation while defending state control over data and AI deployment. —Steven Wolfe Pereira, Forbes.com, 20 Jan. 2026

Recent decisions by the United States to step back from international climate cooperation signals a dangerous turn inward at precisely the moment when collective problem-solving is most needed. —Hindou Oumarou Ibrahim, Time, 20 Jan. 2026

In a statement to the Orlando Sentinel, Department of Homeland Security assistant secretary Tricia McLaughlin touted the cooperation of state police with ICE. —Natalia Jaramillo, The Orlando Sentinel, 19 Jan. 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