The Collaborative International Dictionary of English v.0.48:

Proleptic \Pro*lep"tic\, Proleptical \Pro*lep"tic*al\, a. [Gr.
   ?: cf. F. proleptique.]
   [1913 Webster]
   1. Of or pertaining to prolepsis; anticipative. "A far-seeing
      or proleptic wisdom." --De Quincey.
      [1913 Webster]

   2. Previous; antecedent. --Glanvill.
      [1913 Webster]

   3. (Med.) Anticipating the usual time; -- applied to a
      periodical disease whose paroxysms return at an earlier
      hour at every repetition.
      [1913 Webster]