The philosophical doctrine of Heraclitus that all things are in constant flux and change, with conflict and opposite forces being fundamental to reality.
From Heraclitus + '-ism' (philosophical system suffix). Developed as a school of thought in ancient Greece around 500 BCE and has influenced philosophy ever since, especially through later reinterpretations.
Heracliteanism sounds ancient, but it's actually very modern—it anticipated Darwin's evolution, Einstein's relativity, and modern ecology's idea that systems are constantly shifting and adapting.
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