The Collaborative International Dictionary of English v.0.48:

Particularization \Par*tic`u*lar*i*za"tion\, n.
   The act of particularizing. --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

particularization
    n 1: an individualized description of a particular instance
         [syn: particularization, particularisation,
         detailing]