The Collaborative International Dictionary of English v.0.48:

Technician \Tech*ni"cian\, n.
   a person trained or skilled in the technical details of a
   particular art or science, especially one skilled at
   operating, maintaining, or repairing equipment, in contrast
   to the theory or informational content of a craft; --
   formerly also called a technicist.

   Note: In computer software companies, individuals skilled at
         the details of using programs and employed to help
         customers to install or use software or troubleshoot
         software problems for are also called technicians.
         [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

technician
    n 1: someone whose occupation involves training in a specific
         technical process
    2: someone known for high skill in some intellectual or artistic
       technique

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "technician":
   Admirable Crichton, adept, aficionado, amateur, apprentice,
   artificer, artisan, artist, attache, authority, buff, connaisseur,
   connoisseur, consultant, cordon bleu, crack shot, craftsman,
   craftswoman, critic, dead shot, dilettante, diplomat, diplomatist,
   elder statesman, experienced hand, expert, expert consultant, fan,
   freak, graduate, handicraftsman, handy man, journeyman, marksman,
   master, master carpenter, master craftsman, mechanic, no slouch,
   nut, politician, prentice, pro, professional, professor,
   proficient, pundit, savant, scholar, shark, sharp, specialist,
   statesman, technical adviser, technical expert, wright