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coact (v.)

"to compel, force," c. 1400, from Latin coactare "constrain, force," frequentative of cogere (past participle coactus) "to compel," also "curdle, collect" (see cogent). Related: Coacted; coacting; coaction; coactive. 

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Definitions of coact from WordNet

coact (v.)
act together, as of organisms;
From wordnet.princeton.edu