Source : Webster's Revised Unabridged Dictionary (1913)

Implex \Im"plex\, a. [L. implexus, p. p. of implectere to
   infold; pref. im- in + plectere to plait: cf. F implexe.]
   Intricate; entangled; complicated; complex.

         The fable of every poem is . . . simple or implex. it
         is called simple when there is no change of fortune in
         it; implex, when the fortune of the chief actor changes
         from bad to good, or from good to bad.   --Addison.