Thesaurus.com
Dictionary.com
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.

“I’m here because of the moral cooperation between our two countries,” Vance said on a stage he shared with Orbán.

From Salon • Apr. 7, 2026

"I've been remarkably impressed with the degree of cooperation from senior medical staff," he said.

From BBC • Apr. 7, 2026

Instead, the committee of agency leaders could have had a more lasting and positive impact if it had worked to build trust and cooperation among industry, conservation groups and agencies.

From Salon • Apr. 7, 2026

The rare move points to cooperation on counternarcotics enforcement ahead of the planned Trump-Xi summit.

From The Wall Street Journal • Apr. 3, 2026

But can such cooperation actually succeed in saving the fish?

From "Silent Spring" by Rachel Carson