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

Authoritarian leader Kim Jong Un has taken a hard line toward Seoul and has suspended virtually all dialogue and cooperation with the South in recent years. — Arkansas Online, 24 Oct. 2026

During a meeting on Saturday, Wang told Kim that China was ready to use the bridge’s opening to expand personnel exchanges and economic and trade cooperation, Xinhua said. — CNN Money, 24 Oct. 2026

Talks would focus on cooperation in energy, nuclear plants, sustainable mining and the defense industry. — ABC News, 22 Oct. 2026

Pursuit to end Sacramento contract with feds Sacramento has long designated itself a sanctuary city, limiting local cooperation with federal immigration enforcement. — Jennah Pendleton, Sacbee.com, 22 Oct. 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