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 Governor's office applies pressure The governor's office has accused Dallas of violating a cooperation agreement and is threatening to withhold millions in state funding unless the city changes its policies. —Robbie Owens, CBS News, 18 Apr. 2026

Russia's Rosatom is building Egypt’s first reactor and has cooperation agreements with Ethiopia, Burkina Faso, Ghana, Tanzania and Niger, spanning major projects, research centers, uranium processing facilities and training programs. —ABC News, 17 Apr. 2026

Mine clearance in the strait—which Trump posted on Truth Social is happening with Iran’s cooperation—could take the better part of a month depending on cooperation. —Eva Roytburg, Fortune, 17 Apr. 2026

The decision was made in cooperation with Young's family, ABC 24 Memphis reported. —Ingrid Vasquez, PEOPLE, 17 Apr. 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