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