The Collaborative International Dictionary of English v.0.48:

Prolepsis \Pro*lep"sis\, n. [L., fr. Gr. ?, from ? to take
   beforehand; ? before + ? to take.]
   [1913 Webster]
   1. (Rhet.)
      (a) A figure by which objections are anticipated or
          prevented. --Abp. Bramhall.
      (b) A necessary truth or assumption; a first or assumed
          principle.
          [1913 Webster]

   2. (Chron.) An error in chronology, consisting in an event
      being dated before the actual time.
      [1913 Webster]

   3. (Gram.) The application of an adjective to a noun in
      anticipation, or to denote the result, of the action of
      the verb; as, to strike one dumb.
      [1913 Webster] Proleptic

WordNet (r) 3.0 (2006):

prolepsis
    n 1: anticipating and answering objections in advance