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

Much of Iran’s overseas wealth is held in third countries and Washington would need cooperation from foreign governments to seize it. — Magdalena Del Valle, Fortune, 15 Aug. 2026

Some of their potential areas of cooperation include AI and digital twins. — Georgina Jedikovska, Interesting Engineering, 14 Aug. 2026

As of last year, all 67 counties had signed cooperation agreements with Immigration and Customs Enforcement (ICE), according to the Florida Sheriffs Association. — Marisa Peñaloza, NPR, 14 Aug. 2026

Reflecting positively on Winston Churchill and his family’s support for Israel during the Six Day War, the Israeli premier said the days of such close cooperation are over. — Timothy Nerozzi, The Washington Examiner, 14 Aug. 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