Source : Webster's Revised Unabridged Dictionary (1913)

Episodic \Ep`i*so"dic\, Episodical \Ep`i*so"dic*al\, a. [Cf. F.
   ['e]pisodique. See {Episode}.]
   Of or pertaining to an episode; adventitious. --
   {Ep`i*so"dic*al*ly}, adv.

         Such a figure as Jacob Brattle, purely episodical
         though it be, is an excellent English portrait. --H.
                                                  James.

Source : WordNet®

episodic
     adj 1: of writing or narration; divided into or composed of
            episodes; "the book is episodic and the incidents
            don't always hang together"
     2: occurring or appearing at usually irregular intervals;
        "episodic in his affections"; "occasional headaches" [syn:
         {occasional}]
     3: limited in duration to a single episode; "an account
        concerned primarily with episodic events such as the
        succession of rulers"