The Collaborative International Dictionary of English v.0.48:

Mechanic \Me*chan"ic\, n. [F. m['e]canique mechanics. See
   Mechanic, a.]
   1. The art of the application of the laws of motion or force
      to construction. [Obs.]
      [1913 Webster]

   2. A mechanician; an artisan; an artificer; one who practices
      any mechanic art; one skilled or employed in shaping and
      uniting materials, as wood, metal, etc., into any kind of
      structure, machine, or other object, requiring the use of
      tools, or instruments. Also, a technician who maintains or
      repairs machinery; as, an auto mechanic.
      [1913 Webster +PJC]

            An art quite lost with our mechanics. --Sir T.
                                                  Browne.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mechanic \Me*chan"ic\ (m[-e]*k[a^]n"[i^]k), a. [F. m['e]canique,
   L. mechanicus, Gr. mhchaniko`s, fr. mhchanh` a machine. See
   Machine.]
   1. Having to do with the application of the laws of motion in
      the art of constructing or making things; of or pertaining
      to mechanics; mechanical; as, the mechanic arts. "These
      mechanic philosophers." --Ray.
      [1913 Webster]

            Mechanic slaves,
            With greasy aprons, rules, and hammers. --Shak.
      [1913 Webster]

   2. Of or pertaining to a mechanic or artificer, or to the
      class of artisans; hence, rude; common; vulgar.
      [1913 Webster]

            To make a god, a hero, or a king
            Descend to a mechanic dialect.        --Roscommon.
      [1913 Webster]

            Sometimes he ply'd the strong, mechanic tool.
                                                  --Thomson.
      [1913 Webster]

   3. Base. [Obs.] --Whitlock.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mechanic
    adj 1: resembling the action of a machine; "from blank to blank
           a threadless way I pushed mechanic feet"- Emily Dickenson
    n 1: a craftsman skilled in operating machine tools [syn:
         machinist, mechanic, shop mechanic]
    2: someone whose occupation is repairing and maintaining
       automobiles [syn: automobile mechanic, auto-mechanic,
       car-mechanic, mechanic, grease monkey]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "mechanic":
   aeromechanic, aeronautical engineer, aircraftsman, apprentice,
   artificer, artisan, artist, cobbler, craftsman, craftswoman,
   doctor, fixer, flight tester, grease monkey, ground tester,
   handicraftsman, jet engineer, journeyman, little Miss Fixit,
   machinist, maintenance man, master, master carpenter,
   master craftsman, mechanician, mender, prentice, renovator,
   repairer, repairman, restorer, rigger, rocket engineer, serviceman,
   technician, tinker, trouble man, troubleshooter, wright