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

Permits and city cooperation are necessary when large-scale private events require the use of public space (like street closures) or city services (more cops). — Ethan Shanfeld, Variety, 10 July 2026

The public screenings take shape through grassroots cooperation. — ABC News, 10 July 2026

The pairing also serves as a rare moment of cooperation between Phillies and Dodgers personnel before the clubs resume competing for National League supremacy later this season. — Peter Chawaga, Forbes.com, 10 July 2026

The incident also highlighted intelligence cooperation between Taiwan and the US. — Jijo Malayil, Interesting Engineering, 10 July 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