from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to the Greek philosophers or philosophical systems of thought before Socrates.
  • n. A pre-Socratic philosopher.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Existing in Ancient Greece before the flourishing of the philosopher Socrates (circa 469–399 BC).
  • n. Any one of the pre-Socratic philosophers, viz. Thales (circa 624–546 BC), Anaximander (circa 610–546 BC), Anaximenes (circa 585–525 BC), Pythagoras (circa 576–495 BC), Xenophanes (circa 570–480 BC), Heraclitus (circa 535–475 BC), Parmenides (early-5th century BC), Anaxagoras (circa 500–428 BC), Empedocles (circa 490–430 BC), and Democritus (circa 460–370 BC).


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