To act or work together with another person or thing toward a common goal or purpose.
From Latin 'co-' (together) + 'act' (to do or perform). This prefix-based word formation became common in English scientific and philosophical writing during the 17th-18th centuries to describe collaborative action.
The prefix 'co-' is extraordinarily powerful in English—it transforms almost any action word to mean 'doing it together,' and 'coact' is one of the most elegant ways to describe teamwork without needing extra words.
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