The process or result of acting together; collaboration or joint action between two or more entities.
From 'coact' + '-ion' (a Latin-derived suffix forming nouns). This noun formation follows the pattern of action, reaction, and interaction, all built on the Latin root 'act' meaning 'to do.'
In biology, 'coaction' describes how species interact in ecosystems—it's the recognition that nothing in nature acts alone, which was revolutionary thinking before ecology became a recognized science.
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