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 two countries signed dozens of bilateral agreements, including in a 20-year cooperation deal to repair and overhaul Venezuelan refineries and enhance military relations. —Mostafa Salem, CNN Money, 7 Jan. 2026

Coalition members also agreed to carry on with long-term military support for Ukraine and pledged defense cooperation, including training, defense production and intelligence sharing. —Emma Bussey, FOXNews.com, 7 Jan. 2026

Following the Cold War, the Arctic was largely an area of international cooperation. —Danica Kirka, Los Angeles Times, 6 Jan. 2026

By that time, the three host nations will have delivered a powerful and positive message to the international community — demonstrating the enduring strength of friendship, cooperation and hemispheric unity through the world’s most beloved game. —Alicia G Kerber Palma, San Diego Union-Tribune, 6 Jan. 2026

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