cooperation

[koh-op-uh-rey-shuhn] / koʊˌɒp əˈreɪ ʃən /

NOUN

mutual effort

Synonyms

STRONGEST

aid assistance collaboration participation partnership service unity

STRONG

alliance cahoots coaction coalition combination communion company concert concurrence confederacy confederation conspiracy federation fusion give-and-take harmony help helpfulness logrolling partisanship reciprocity responsiveness society symbiosis synergism synergy teamwork unanimity union

WEAK

coadjuvancy combined effort confunction doing business with esprit de corps playing ball teaming

Antonyms

STRONG

antagonism disagreement discord disunion disunity division divorce hostility management separation

WEAK

blockage delay encumbrance hindrance obstruction prevention stoppage

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The UK's increased cooperation with other European powers is already particularly evident when it comes to security and defence - take the common approach on Ukraine, for example, with the UK in a leadership role.

From BBC • Apr. 16, 2026

Likewise, Velasco has vowed that Mexico would never yield its “sovereignty,” assuring his fellow diplomats that the country would “maintain a cooperation in matters of security ... without subordination.”

From Los Angeles Times • Apr. 14, 2026

Qatar has signed a cooperation agreement with Ukraine, too.

From The Wall Street Journal • Apr. 12, 2026

"I look forward to further strengthening cooperation between Croatia and Hungary, both bilaterally and at the European level," said Croatia's Prime Minister Andrej Plenkovic after a phone call with Magyar.

From Barron's • Apr. 12, 2026

Nor would I publish the story without the full cooperation and approval of Mrs. Lakes’ family.

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot

Vocabulary lists containing cooperation

Ecology - Interdependent Relationships in Ecosystems - Introductory

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Lyndon B. Johnson on "The Great Society" (1964)

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John F. Kennedy, Inaugural Address, January 20, 1961

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