The Collaborative International Dictionary of English v.0.48:

Peripatetic \Per`i*pa*tet"ic\, a. [L. peripateticus, Gr. ?, fr.
   ? to walk about; peri` about + ? to walk: cf. F.
   p['e]ripat['e]tique.]
   1. Walking about; itinerant.
      [1913 Webster]

   2. Of or pertaining to the philosophy taught by Aristotle
      (who gave his instructions while walking in the Lyceum at
      Athens), or to his followers. "The true peripatetic
      school." --Howell.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Peripatetic \Per`i*pa*tet"ic\, n.
   1. One who walks about; a pedestrian; an itinerant. --Tatler.
      [1913 Webster]

   2. A disciple of Aristotle; an Aristotelian.
      [1913 Webster]

WordNet (r) 3.0 (2006):

peripatetic
    adj 1: of or relating to Aristotle or his philosophy;
           "Aristotelean logic" [syn: Aristotelian,
           Aristotelean, Aristotelic, peripatetic]
    2: traveling especially on foot; "peripatetic country
       preachers"; "a poor wayfaring stranger" [syn: peripatetic,
       wayfaring]
    n 1: a person who walks from place to place
    2: a follower of Aristotle or an adherent of Aristotelianism
       [syn: Aristotelian, Aristotelean, Peripatetic]

The Devil's Dictionary (1881-1906):

PERIPATETIC, adj.  Walking about.  Relating to the philosophy of
Aristotle, who, while expounding it, moved from place to place in
order to avoid his pupil's objections.  A needless precaution -- they
knew no more of the matter than he.