The Collaborative International Dictionary of English v.0.48:

Itinerant \I*tin"er*ant\, a.
   One who travels from place to place, particularly a preacher;
   one who is unsettled.
   [1913 Webster]

         Glad to turn itinerant,
         To stroll and teach from town to town.   --Hudibras.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Itinerant \I*tin"er*ant\ ([-i]*t[i^]n"[~e]r*ant), a. [LL.
   itinerans, -antis, p. pr. of itinerare to make a journey, fr.
   L. iter, itineris, a walk, way, journey. See Errant,
   Issue.]
   Passing or traveling about a country; going or preaching on a
   circuit; wandering; not settled; as, an itinerant preacher;
   an itinerant peddler.
   [1913 Webster]

         The king's own courts were then itinerant, being kept
         in the king's palace, and removing with his household
         in those royal progresses which he continually made.
                                                  --Blackstone.
   [1913 Webster]

WordNet (r) 3.0 (2006):

itinerant
    adj 1: traveling from place to place to work; "itinerant labor";
           "an itinerant judge"
    n 1: a laborer who moves from place to place as demanded by
         employment; "itinerant traders" [syn: itinerant, gypsy,
         gipsy]