Communicating or working together with another person or thing, affecting each other.
From 'inter-' (between, among) plus 'acting' (from Latin 'agere' meaning to do). The term gained prominence in the 1900s with systems thinking and social science.
Everything in life is about interactions—your brain cells interact with chemicals, people interact in relationships, atoms interact to form molecules—understanding interactions is understanding how the universe actually works.
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