The Collaborative International Dictionary of English v.0.48:

Denunciation \De*nun`ci*a"tion\, n. [L. denuntiatio, -ciatio.]
   1. Proclamation; announcement; a publishing. [Obs.]
      [1913 Webster]

            Public . . . denunciation of banns before marriage.
                                                  --Bp. Hall.
      [1913 Webster]

   2. The act of denouncing; public menace or accusation; the
      act of inveighing against, stigmatizing, or publicly
      arraigning; arraignment.
      [1913 Webster]

   3. That by which anything is denounced; threat of evil;
      public menace or accusation; arraignment.
      [1913 Webster]

            Uttering bold denunciations of ecclesiastical error.
                                                  --Motley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

denunciation
    n 1: a public act of denouncing [syn: denunciation,
         denouncement]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "denunciation":
   accusal, accusation, accusing, allegation, allegement, anathema,
   anathematizing, arraignment, ban, bill of particulars, blame,
   blasphemy, bringing of charges, bringing to book, bulldozing,
   castigation, censure, charge, commination, complaint, condemnation,
   conviction, count, curse, damnation, death sentence, death warrant,
   decrial, delation, denouncement, doom, empty threat, evil eye,
   excommunication, excoriation, execration, flaying, foreboding,
   fulmination, fustigation, guilty verdict, hex, idle threat,
   imminence, impeachment, implication, implied threat, imprecation,
   imputation, indictment, information, innuendo, insinuation,
   intimidation, judgment, lawsuit, laying of charges, malison,
   malocchio, menace, pillorying, plaint, promise of harm,
   proscription, prosecution, rap, reprehension, reproach,
   reprobation, sentence, skinning alive, stricture, suit,
   sword of Damocles, taxing, threat, threateningness, threatfulness,
   thundering, true bill, unspoken accusation, veiled accusation,
   verdict of guilty, warning, whammy



Bouvier's Law Dictionary, Revised 6th Ed (1856):

DENUNCIATION, crim. law. This term is used by the civilians to signify the
act by which au individual informs a public officer, whose duty it is to
prosecute offenders, that a crime has been committed. It differs from a
complaint. (q.v.) Vide 1 Bro. C. L. 447; 2 Id. 389; Ayl. Parer. 210, Poth.
Proc. Cr. sect. 2, Sec. 2.