verb

cooperate

koh-OP-uh-rayt

verb

To work together with others toward a shared goal.

"The two departments agreed to cooperate on the new project."

"Witnesses were asked to cooperate fully with the investigation."

How to Use Cooperate

Learner’s notes

In plain EnglishTo work with someone else instead of against them or alone.

Common pairings

cooperate with authorities refuse to cooperate cooperate fully

cooperated past tense, cooperates singular

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Can you complete this real example?

The two departments agreed to _____ on the new project.

From Late Latin cooperari ("to work with"), built from co- ("together") plus operari ("to work") — the same root that gives us "operate."

coact coadjute co-op liaise make common cause play ball

collaborate liaise

ate date rate mate fate gate hate pate late Nate Kate cate

coact coadjute co-op liaise make common cause play ball collaborate