The Collaborative International Dictionary of English v.0.48:

Anathematization \A*nath`e*ma*ti*za"tion\, n. [LL.
   anathematisatio.]
   The act of anathematizing, or denouncing as accursed;
   imprecation. --Barrow.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anathematization
    n 1: the formal act of pronouncing (someone or something)
         accursed [syn: anathematization, anathematisation]