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 Moon in Aquarius moves through your 4th House and trines Venus in Gemini, helping emotional honesty and practical cooperation work together. —Tarot.com, Hartford Courant, 9 May 2026

The cooperation between the mongooses enables culture and teaching, but also incredible violence. —Big Think, 8 May 2026

And fundamentally, that top-down government solutions have a tendency to stifle bottom-up solutions that can emerge from the voluntary cooperation of free people. —The Editorial Board, Oc Register, 8 May 2026

And Bianco’s rhetoric about forcing changes in state law enforcement — especially on immigration — without the cooperation of Democratic supermajorities in the Legislature is authoritarian nonsense. —U T Editorial Board, San Diego Union-Tribune, 8 May 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