περιπατητικός

Aristotle taught at the Lyceum in Athens beginning around 335 BCE. He had a habit of pacing the colonnaded walkway — the peripatos — while lecturing. His students walked with him. The Greek word peripatein means 'to walk about,' and from this simple physical habit, an entire school of philosophy got its name: the Peripatetics.

The Peripatetic school lasted over two centuries after Aristotle's death in 322 BCE. Theophrastus succeeded him and expanded the Lyceum's botanical and scientific work. Strato of Lampsacus followed, pushing the school toward empirical observation. But the name stuck to the walking, not the thinking. Philosophers who explored logic, ethics, physics, and metaphysics were remembered by their footsteps.

Latin borrowed peripateticus directly from Greek. Medieval scholars used it to describe Aristotelian philosophy as distinct from Platonic thought. By the 1400s, English had adopted peripatetic with a broader meaning — anyone who wanders from place to place, any itinerant worker or traveler.

The philosophical meaning faded. Today peripatetic mostly describes someone who moves constantly — a peripatetic lifestyle, a peripatetic consultant. The connection to Aristotle survives only in academic philosophy. But the word preserves a truth about thinking that neuroscience has confirmed: walking stimulates cognition. Aristotle was onto something physical, not just philosophical.