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

Let curiosity guide cooperation toward a wiser agreement. — Tarot.com, Baltimore Sun, 27 June 2026

The military cooperation is a stark illustration of the recent reversal in the relationship between the US and Venezuela. — Osmary Hernández, CNN Money, 27 June 2026

At camp, children often learn about patriotism, discipline, cooperation, leadership and self-reliance. — Derek H. Alderman, The Conversation, 26 June 2026

Funding for those areas doesn’t come from the federal agencies responsible for development cooperation or humanitarian aid, but from various state agencies. — Christine Ro, Forbes.com, 26 June 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