Source : Webster's Revised Unabridged Dictionary (1913)

Subjectivism \Sub*jec"tiv*ism\, n. (Metaph.)
   Any philosophical doctrine which refers all knowledge to, and
   founds it upon, any subjective states; egoism.

Source : WordNet®

subjectivism
     n 1: (philosophy) the doctrine that knowledge and value are
          dependent on and limited by your subjective experience
     2: the quality of being subjective