Heraclitus

Part of speech: noun

Definitions

1. An ancient Greek philosopher renowned for asserting that permanence is an illusion, his teachings highlight the ever-changing nature of reality and the significance of oppositions in understanding existence
2. A significant pre-Socratic figure who proposed that the world's state is one of continuous transformation, illustrating his views through the metaphor of rivers and emphasizing the harmony found in contradictions
3. A thinker from ancient Greece famous for the idea that everything is in constant motion and nothing stays the same

Etymology: Heraclitus of Ephesus lived around 500 BCE, and the name he carried was already a compound in his own language. "Hērákleitos" combines "Hēra", the goddess Hera, with "kleitos", a word meaning "glorious" or "famous", so the name roughly means "glory of Hera." Latin took the name over as "Hēraclītus", and English borrowed it from there, so the philosopher's name reached modern readers by way of Rome rather than directly from Greek. The name is now used as a common noun for a person who holds the philosopher's doctrines, and the sense that matters is his famous claim that everything is in flux, captured in the saying that no one steps into the same river twice. The noun carries that idea of constant change, and of opposites defining one another, into everyday speech about thinkers who take the same view.