The Collaborative International Dictionary of English v.0.48:

Subjectivity \Sub`jec*tiv"i*ty\, n.
   The quality or state of being subjective; character of the
   subject.
   [1913 Webster]

WordNet (r) 3.0 (2006):

subjectivity
    n 1: judgment based on individual personal impressions and
         feelings and opinions rather than external facts [syn:
         subjectivity, subjectiveness]