The Collaborative International Dictionary of English v.0.48:

Focalization \Fo`cal*i*za"tion\, n.
   The act of focalizing or bringing to a focus, or the state of
   being focalized.
   [1913 Webster]

WordNet (r) 3.0 (2006):

focalization
    n 1: the confinement of an infection to a limited area [syn:
         focalization, focalisation]
    2: the act of bringing into focus [syn: focalization,
       focalisation, focusing]