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

• 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

Jung Yeon-Je / AFP via Getty Images file Kim has also deepened his country’s military cooperation with Russia, sending artillery and thousands of troops to support President Vladimir Putin’s war against Ukraine. —Stella Kim, NBC news, 26 Sep. 2025

As one of the world’s busiest shipping corridors, its management should fall under multilateral cooperation. —Morgan Chalfant, semafor.com, 26 Sep. 2025

The lawsuit details what Justice says is a lack of cooperation. —David Lightman, Sacbee.com, 26 Sep. 2025

All wastewater is treated in cooperation with the industrial park, but the mill aims to have a closed-loop wastewater system by the end of 2025. —Angela Velasquez, Sourcing Journal, 26 Sep. 2025

Word History

Etymology

see cooperate

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for cooperation

• abbreviation
• abomination
• acceleration
• accentuation
• accommodation
• accreditation
• acculturation
• accumulation
• acetylation
• adjudication
• administration
• adulteration

Kids Definition

cooperation

noun

co·​op·​er·​a·​tion kō-ˌäp-ə-ˈrā-shən 

: the act or process of cooperating