The Collaborative International Dictionary of English v.0.48:

Calumniation \Ca*lum`ni*a"tion\
   (k[.a]*l[u^]m`n[i^]*[=a]"sh[u^]n), n.
   False accusation of crime or offense, or a malicious and
   false representation of the words or actions of another, with
   a view to injure his good name.
   [1913 Webster]

         The calumniation of her principal counselors. --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calumniation
    n 1: a false accusation of an offense or a malicious
         misrepresentation of someone's words or actions [syn:
         defamation, calumny, calumniation, obloquy,
         traducement, hatchet job]