Plural of interaction; instances of two or more things having an effect upon one another. Communications or dealings between people or groups.
From Latin 'inter-' (between) + 'actio' (action), from 'agere' (to do). Coined in the 17th century to describe reciprocal actions between entities.
The beauty of 'interaction' lies in its recognition that nothing exists in isolation - every action creates a reaction, every cause becomes an effect. It's the linguistic embodiment of interconnectedness.
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