Countable: a person who travels from place to place; also, a follower of Aristotle (usually capitalized).
Definitionen
A person who travels from place to place, especially for work or business. As a peripatetic, she never stayed in one city for more than a few months.
A follower or adherent of Aristotle and his philosophical teachings (usually capitalized). The Peripatetics gathered at the Lyceum to discuss metaphysics.