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

Bringing ‘Marge’ home In 2020, Wisconsin’s National Guard and Papua New Guinea entered into a military agreement though the State Partnership Program, which promotes cooperation through military exchanges. — Alexandra Skores, CNN Money, 8 Aug. 2026

Huckabee noted that this partnership played out in a variety of areas, including military cooperation, especially as both worked to stop the Iranian regime from gaining nuclear arms. — Rachel Wolf, FOXNews.com, 8 Aug. 2026

Sources close to the production have confirmed to Deadline that filming in these areas will take place in cooperation with Westminster City Council. — Nada Aboul Kheir, Deadline, 7 Aug. 2026

Berlan believes meaningful progress will require cooperation between brands, manufacturers, technology developers, and consumers. — Christopher McFadden, Interesting Engineering, 7 Aug. 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