Source : Webster's Revised Unabridged Dictionary (1913)

Specialism \Spe"cial*ism\, n.
   Devotion to a particular and restricted part or branch of
   knowledge, art, or science; as, medical specialism.

Source : WordNet®

specialism
     n 1: the concentration of your efforts on a particular field of
          study or occupation
     2: the special line of work you have adopted as your career;
        "his specialization is gastroenterology" [syn: {specialization},
         {specialisation}, {specialty}, {speciality}]