Source : Webster's Revised Unabridged Dictionary (1913)

Hysteron proteron \Hys"te*ron prot"e*ron\ [NL., fr. Gr. ? the
   latter, following + ? before, others, sooner.] (Rhet.)
   (a) A figure in which the natural order of sense is reversed;
       hysterology; as, valet atque vivit, ``he is well and
       lives.''
   (b) An inversion of logical order, in which the conclusion is
       put before the premises, or the thing proved before the
       evidence.

Source : WordNet®

hysteron proteron
     n 1: reversal of normal order of two words or sentences etc. (as
          in `bred and born')
     2: the logical fallacy of using as a true premise a proposition
        that is yet to be proved