Definitions

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 plan will be carried out in cooperation with Iran, Oman and the U.S.,” the analysts add.

From The Wall Street Journal • Jun. 23, 2026

IMO secretary-general Arsenio Dominguez said the "large-scale operation" would be carried out in cooperation with Iran, Oman, the US, other coastal states in the region and the maritime industry.

From BBC • Jun. 23, 2026

Mr. de la Espriella lived in Miami for more than a decade, carries a U.S. passport and favors cooperation with the U.S.

From The Wall Street Journal • Jun. 22, 2026

"Ukraine is grateful to the Polish People for their support and cooperation," Zelensky's statement added.

From Barron's • Jun. 20, 2026

Left to themselves, they devised systems of cooperation and work sharing; when there was a crisis, they rose to it.

From "Nickel and Dimed: On (Not) Getting By in America" by Barbara Ehrenreich

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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