The Collaborative International Dictionary of English v.0.48:

Predication \Pred`i*ca"tion\, n. [L. praedicatio: cf. F.
   pr['e]dication.]
   1. The act of predicating, or of affirming one thing of
      another; affirmation; assertion. --Locke.
      [1913 Webster]

   2. Preaching. [Obs. or Scot.] --Chaucer.
      [1913 Webster]

WordNet (r) 3.0 (2006):

predication
    n 1: (logic) a declaration of something self-evident; something
         that can be assumed as the basis for argument [syn:
         postulation, predication]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "predication":
   affirmance, affirmation, allegation, announcement, annunciation,
   assertion, asseveration, averment, avouchment, avowal, conclusion,
   creed, declaration, dictum, enunciation, ipse dixit, manifesto,
   position, position paper, positive declaration, predicate,
   proclamation, profession, pronouncement, proposition, protest,
   protestation, say, say-so, saying, stance, stand, statement,
   utterance, vouch, word